Ceylon tree healing a cut: perfuming the striking axe

By Prof. Kirthi Tennakone

The genius British chemist Sir Humphry Davy scribbled a stanza in his notebook, saying he is like the fair Ceylon tree, which heals a cut and perfumes the axe by secreting an oil – a strange comparison.

That illustrious tree is on the verge of extinction. We cut down trees, feeding and protecting us. Yet trees are not after vengeance, they perspire (transpire) to save us from extinction.

Humphry Davy

Humphry Davy, one of the greatest exponents of the scientific method with a poetic inclination, was born in December 1778 in the remote coastal town of Penance, in Cornwall, England. While studying at the grammar school, he wrote poetry and wandered in the beaches and woods, but could not finish schooling. At sixteen, his father died. To support the family, Davy worked as an apprentice to an apothecary and acquainted a liking for chemistry. He pilfered chemicals from the shelves and did experiments at home, learning chemistry by himself. Noting his exceptional talent, an informed friend of his mother, introduced him to Thomas Beddoes, a physician philanthropist and prolific writer, noteworthy for controversial views. Deeply concerned about the poor suffering tuberculosis, he ran a hospital treating patients free and hoped to find a cure for the disease.

Dr. Beddoes employed Davy in his institute, devoted to studying the medicinal properties of gases. After day and night experimentation, Davy exclaimed breathing nitrous oxide (subsequently known as laughing gas) induces a pleasant calmness, suggesting a way to relieve the pain of operations.

The close associates of Dr. Beddoes were equally radical poets; Robert Southey and Samuel Taylor Coleridge. They not only risked the repressive actions of the British Government by openly supporting the ideals of the French Revolution but volunteered as guinea pigs to test Davy’s hypothesis. Robert Southey after inhaling nitrous oxide, said “The atmospheres of the highest of all possible heavens must be composed of this gas”. Samuel Coleridge was more realistic. He described the experience of inhaling laughing gas as the sudden transfer from a chilly winter to a warm spring. William Wordsworth, another friend of Beddoes, visited Humphrey Davy and consented that poetry and chemistry are similar because both subjects deal with material things.

The invention of the first anesthetic agent and acclaim by eminent literary men qualified Humphry Davy, who had no college degree, for a professorship at the prestigious Royal Institution in London. There he performed extraordinarily. Today, we insist on a first-class degree for the same job!

At the Royal Institution, Davy made groundbreaking discoveries one after another. Isolated eight chemical elements for the first time, opened the field of electrochemistry and showed the world how to liquefy gases. He invented the safety lamp to light coal mines while preventing flammable gases existing there from catching fire explosively.

As a tradition, the Royal Institution presented lectures to the general public highlighting the achievements of science. Humphry Davy’s lectures were one of the most popular events in London, at that time. The theater was packed with people from all walks of life. Appreciating his intellect and stunning good looks, aristocratic women admired him. Men raising their hands volunteered lifting things to the podium.

In one of his lectures, Davy showed a piece of potassium metal, first extracted and named by him and dropped it into water. Astounding the audience, the material caught fire with a purplish flame and exploded. People saw something dropped into water catch fire, for the first time. Seventy-odd years ago, I witnessed the same experiment as a seventh grader in a rural school and displayed by a teacher from South India. Today, the phenomenon is rarely demonstrated in chemistry classes in our schools. Students have no time or interest in experiencing inspirational fascinations. They hurry to tutors to cram the workings of the ‘covalent bond’ fitting atoms in organic molecules, merely to pass an exam and become specialists! No new discoveries of anesthetics or cures, but escalating fees for consultations. The problem seems to be that we do chemistry without poetry and specialization without empathy.

In 1820, Humphry Davy was elected president of the Royal Society unopposed. Despite its supremacy, the body functioned as a club of literary elites proud of a degree from Oxford after schooling in Eaton. Davy proposed changes to orient society’s affairs more towards scientific inquiry and promote greater public participation. Unfortunately, he met with opposition and criticism. Although his achievements were incomparable, he didn’t belong to the elite group.

Davy was a victim of jealousy. No man or woman succeeds in all endeavors. Yet just one failure suffices for adversaries to discredit him or her. In 1823, the British Admiralty requested Davy to find a solution to the problem of the corrosion of the copper- clad bottoms of naval vessels. He provided an ingenious method, but did not work in this particular case. Davy’s opponents diverted the incident to blemish his reputation in the eyes of the British Establishment.

Davy, in a depressed mood and not experienced enough to face criticism, drafted a verse. Telling us he is like the fair Ceylon plant, the Cingalese tree, which heals a cut by secreting a balmy oil to prevent its decay, while perfuming the axe, a poetic way of expressing his feelings. Possibly, this means, he was not defamed by the attacks of his enemies but instead blessed them.

Humphry Davy didn’t name the tree. Undoubtedly, he heard a story from his younger brother, John Davy, who visited Sri Lanka and looked at many things in our country, curiously and rationally.

John Davy, a surgeon and chemist was posted to Sri Lanka in 1816 as a physician for the British Armed Forces. However, his primary mission has been carrying out scientific investigations in the colony, conquered a year ago. During his nearly four years of occupation, he traveled all over the island, examining the natural environment, indigenous technologies and cultural practices in the country. While in Sri Lanka, he wrote to his brother frequently, presenting his experience in the alien land. On September 18, 1817, Humphry Davy, read a letter from his brother at the Proceedings of the Royal Society describing his journey to Adams Peak, accompanied by Alexander Moon, the Superintendent of Botanical Gardens, Kalutara. Both of them curious about flora in the Island, came to know the trees used by the inhabitants to extract resin.

When a Doona tree is incised, a pleasant smelling, clear resinous liquid secretes, wetting the axe. Our indigenous people (Veddas) were the first to use the resin as medicine and incense. They saw how the resin oozing after strike of an axe, closed and healed the cut. If the axe bruises the hand accidentally, they ran to a Doona tree and applied the resin and it worked. Later, to extract the resin, trees were wounded multiple times, but plants still survived because the exudate prevented the rot.

The local population exploited aboriginal technology for profit. To get more oil, they axed tree and burnt the wound, eventually killing the tree.

A craft and a paying export business in those days (the1800s), was tapping resin (gas dummala) from Doona (Shorea zeylanica) and related species of trees belonging to the family dipterocarpaceae (dipterocarps). Arabian traders purchased the product, used for making incense, perfumes and varnish and shipped it to Europe and China The thicker resinous oil secreted by the Dorana tree was used mainly for making paints.

Undoubtedly, John Davy, told his brother, what he learned in Sri Lanka. The “fair Cingalese tree of Davy” is certainly a Doona species, not cinnamon, as speculated by a European historian. Cinnamon doesn’t fit into the story.

Dipterocarpaceae

Dipterocarps were the dominant species of trees in our forests and thickets everywhere centuries ago. Think for a moment about why there are so many villages and place names with prefixes; Hora, Dorana and Doona. For example, “Horana”, derived from “Hora Arana” means a forest of Hora trees. Today, a Hora tree is hard to spot in a village. As a child, I played with the spinning fruits of the Hora tree, not remotely maneuvered helicopter drones but later understood the mathematics of aerodynamics.

No more Hora, Doona and Dorana trees in Horanpella, Doonagaha and Doranagoda. A few of these in Sinharaja and other reserves need to be saved preciously.

Again, guess why there are more than one hundred villages and localities in Sri Lanka with the prefix “Dummala”. The fossilised resin of dipterocarp vegetation is dummala (bimdummala). The occurrence of dummala in the locality is the origin of these names. Tens of thousands of years ago, dipterocarp plants existed in abundance. Their resins, resistant to decomposition, accumulated in the soil as dummala.

The plant family dipterocarpacae is a fascinating evolutionary marvel. Originating in Africa more than 100 million years ago, they drifted to India, Sri Lanka and other parts of Southeast Asia. While retaining primitive characters, the family diversified to suit the environment. In a dipterocarp – dominated rain forest, there are tall as well as short species of trees, trapping sunlight optimally and thereby capturing large quantities of carbon. They are the ‘thermostats’ of the planet.

The dominance of dipterocarps owes much to the wind dispersal of seeds. When the winged fruit falls after ripening, they spin like helicopter propellers and carried away by the wind. The average distance the fruit deposits on the ground is not too far from the base of the parent tree, but greater than the width of its canopy, so that the seedling is not shadowed by the parent. The roots of the parent tree extend a distance greater than the canopy width. Seeds deposited in the vicinity of the roots of the parent tree and beyond the extent of the canopy have a special advantage because roots harbor symbiotic fungi. Thus, the seeding gain ready access to sunlight and fungi in soil the promoting growth.

Dipterocarps, so common everywhere in our land until recent times, are now endangered. When John Davy visited Sri Lanka, there were no tea or rubber plantations. Clearing land for cultivation eliminated a good portion of trees. Unfortunately, despite inviting danger, the species yields quality wood. Therefore overexploited for timber, legally and illegally. Many truckloads of timber, would have been used to build one mansion out of unjustly earned money. Imagine the number of trees felled!

They are fast losing hold in other parts of the region because of extensive logging and the expansion of land use.

Dipterocarps survived natural catastrophes such as mega volcanic eruptions, glaciation and asteroid impacts. They have peacefully coexisted with dinosaurs for 65 million years; providing them; food, shade and oxygen. Contrastingly to humans, these mighty animals did not threaten their proliferation. Occasionally, a tree may have been injured by goring creatops (horned dinosaurs), but the oily resin secreted cured the injury.

After an asteroid impact on Earth in the month of June 65 million years ago, dinosaurs and many kinds of plants died out, but dipterocarps survived. Yet they struggle to escape the threat of humans.

Given, sufficient time, evolution is capable of achieving almost ‘anything’ not forbidden by the laws of nature. Through prolonged existence, dipterocarps have acquired and inherited unique characters to suit the environment. Their extinction would irreparably damage the rainforest ecosystem.

I was inspired to be fascinated by the wonders of dipterocarpaceae by my elder brother, the late Jayasumana Tennakone, who played with me, throwing Hora fruits into the air and watching how they spin. We were questioning, how it decides to rotate either clockwise or anticlockwise. Two decades later, the idea helped me fathom a concept in the theory of elementary particle physics.

A part of my ancestral village, Matikotumulla, in the Gampha District, goes by the name “Dummaladeniya”, a beautiful marshy area with paddy fields and a stream. My father walked us to this part of the village frequently. We picked up sizeable pieces of dummala from the stream. He said these are fossils of plants and cannot be minerals. Later, I was enthralled to learn dummala is derived from dipterocarpaceae.

Once, I walked miles in the wilderness to see a Dorana tree. What I saw was a giant tree on its deathbed, tortured by severely burned wounds!

(The author can be reached via email:ktenna@yahoo.co.uk)