Terre Napoleón; a History of French Explorations and Projects in Australia

by Sir Ernest Scott

Of Péron's personal character, and of the value of his scientific work, nothing but high praise can be written. He was but a young man when he died. Had he lived, we cannot doubt that he would have filled an important place among French men of science, for his diligence was coupled with insight, and his love of research was as deep as his aptitude for it was keen. A pleasant picture of the man was penned by Kerandren, who had been one of the surgeons on the expedition to Australia. "Péron," he said* (* Moniteur, January 24, 1811. The Moniteur of June 7, 1812, also contained a eulogy on Péron delivered before the Societe Medicale d'emulation de Paris, by A.J.B. Louis.), "carried upon his face the expression of kindliness and sensibility. The fervour of his mind, the vivacity of his character, were tempered by the extreme goodness of his heart. He made himself useful to most of those who were the companions of his voyage. There was joined to his confidence in his own ability, a great modesty. He was so natural--I would even say so candid--that it was impossible to resist the charm of his manners and his conversation."

Apart from his authorship of the first and part of the second volume of the Voyage de Decouvertes, Péron wrote a number of short "memoires sur divers sujets," suggested to his mind by observations made during the voyage. One of the most valuable of these, from a scientific point of view, was an essay upon the causes of phosphorescence in the sea, frequently observed in tropical and subtropical regions, but occasionally in European waters.*

(* Crabbe described it admirably in The Borough (9 103):

"And now your view upon the ocean turn,
And there the splendour of the waves discern;
Cast but a stone, or strike them with an oar,
And you shall flames within the deep explore;
Or scoop the stream phosphoric as you stand,
And the cold flames shall flash along your hand;
When, lost in wonder, you shall walk and gaze
On weeds that sparkle and on waves that blaze.)

Although Péron was not the first naturalist to explain that this aspect of floating fire given to the waves was due to the presence of multitudes of living organisms, he was the first naturalist to describe their structure and functional processes.* (* Phipson on Phosphorescence (1862) page 113, mentions that as early as 1749 and 1750, Vianetti and Grixellini, two Venetians, discovered in the waters of the Adriatic quantities of luminous animalculae; and the true cause of the phenomena must have occurred to many of those who witnessed it, though groundless and absurd theories were current. Of the creature discovered and described by Péron, Phipson says that it is "one of the most curious of animals. It belongs to the tribe of Tunicata. Each individual resembles a minute cylinder of glowing phosphorus. Sometimes they are seen adhering together in such prodigious numbers that the ocean appears as if covered with an enormous mass of shining phosphorus or molten lava." Professor Moseley investigated the Pyrosoma while with the Challenger expedition. He wrote: "A giant Pyrosoma was caught by us in the deep-sea trawl. It was like a great sac, with its walls of jelly about an inch in thickness. It was four feet long and ten inches in diameter. When a Pyrosoma is stimulated by having its surface touched, the phosphorescent light breaks out just at the spot stimulated, and then spreads over the surface of the colony to the surrounding animals. I wrote my name with my finger on the surface of the giant Pyrosoma as it lay on deck, and my name came out in a few seconds in letters of fire." The author owes this last reference to an excellent paper on "Phosphorescence in Plants and Animals," by Miss Freda Bage, M.Sc., printed in the Victorian Naturalist, 21 page 100 November 1904.) His treatise on the Pyrosoma atlanticum is an extremely interesting example of his scientific work. The creature is weighed and measured; its appearance is described; then it is carefully taken to pieces and its structure and internal organisation are minutely detailed; next there is an account of its functions, and an explanation of how the phosphorescent appearance is produced; and finally its mode of life, nutrition, and system of generation are dealt with. Péron collects a number of specimens, places them in a vessel filled with sea-water, and observes how, at rhythmic intervals, the creature alternately contracts and dilates in a fashion analogous to the art of breathing among more highly organised animals; and he notices that the phosphorescence appears and disappears with these movements, being most fully displayed when the creature's body is most contracted, and disappearing during the moments of most complete expansion. Here we have careful examination and observation, study of the organism in its native habitat, anatomical dissection, and experiment--a piece of biological work exceedingly well done. Cuvier would have read the piece with satisfaction in his pupil.

Other Memoires by Péron, on the temperature of the sea on the surface and at measured depths; on the zoology of the Austral regions; on dysentery in hot countries and the medicinal use of the betel-nut; on sea animals, such as seals; and on the art of maintaining live animals in zoological collections, were valuable; and the subjects on which he wrote are mentioned as indicating the range of his scientific interests. One of his pieces of work which, naturally, aroused much interest in Europe, was an extremely curious investigation relative to the physiological peculiarities of females of the Bushman tribes in South Africa, where Péron made an inland journey for the purpose.* (* There is a technical note on this delicate subject in Girard's F. Péron, Naturaliste, Voyageur aux Terres Australes (Paris, 1857); a book which also gives a good summary of Péron's scientific work.)

When he died, Péron had not had time to apply himself adequately to the enormous mass of material that he had collected. His fertile and curious mind, we cannot doubt, would have enriched the scientific literature of France with many other monographs. The deaths at sea of Bernier and Deleuze also deprived the records of the expedition of contributions which they would have made on their special lines of research. Collections of specimens and piles of memoranda, uninformed by the intelligence of those to whom their meaning is most apparent, are a barren result.

Péron's biological work was done in accordance with the spirit and principles of Cuvier, who stood at the head of European savants in his own field. "Trained for four years in Cuvier's school," wrote the naturalist, "I had for guide not only his method and his principles, but manuscript instructions that he had had the goodness to write for me on my departure from Europe." Cuvier insisted on the importance of structure and function; "to name well you must know well." The part played by the creature in its own share of the world, its nervous organisation, its life as involved in its form, were essentials upon which he laid stress in his teaching; and he imparted to those who came under his influence a breadth of view, a feeling for the unity of nature, that is quite modern, and has governed all the greatest of his successors. "Not only is each being an organism, the whole universe is one, but many million times more complicated; and that which the anatomist does for a single animal--for the microcosm--the naturalist is to do for the macrocosm, for the universal animal, for the play of this immense aggregation of partial organisms." Detailed research, coupled with an outlook on the whole realm of nature--that was the essential principle of Cuvier's science; and it is because we can recognise in Péron a man who had profitably sat at the feet of the great master, that his death before he had applied his zeal to the material collected with so much labour is the more deeply to be regretted.

The few paragraphs in which Péron expressed his views regarding the modification of species may be quoted. It has to be remembered that they were written in the early years of the nineteenth century, when ideas on this subject were in a state of uncertainty rather than of transition, and more than half a century before Darwin gave an entirely new direction to thought by publishing his great hypothesis. Cuvier at this time believed in the fixity of species--constancy in the type with modification in the form of individuals; but his opinions underwent some amount of change in the latter part of his career. The point argued with such gravity, and the conclusion which Péron stresses with the impressiveness of italics, are not such as a naturalist nowadays would think it worth while to elaborate, namely, that organisms having a general structural similarity are modified by climate and environment. It would not require a voyage to another hemisphere to convince a schoolboy of that truth nowadays. But the paragraphs have a certain historical value, for they put what was evidently an important idea to an accomplished naturalist a century ago. They present us, in that aspect, with an interesting bit of pre-Darwinian generalisation.

"Before natural history had acquired a strict and appropriate language of its own," wrote Péron,* (* Voyage de Decouvertes, 1824 edition 3 243.) "when its methods were defective and incomplete, travellers and naturalists confused under one name, in imitation of each other, so to speak, animals which were essentially different. There is no class of the animal kingdom which, in the actual state of things, does not include several orbicular species; that is to say, several species which are in some degree common to all parts of the globe, however they may be modified by geographical and climatic conditions. Other species, although confined to certain latitudes, are, however, usually regarded as common to all climates, and to all seas comprised within these latitudes. The existence of these last animals is regarded as being independent of latitude. To confine ourselves to marine species, one sees it constantly repeated in books of the most estimable character, that the great whale (Balaena mysticetus, Linn.) is found equally amidst the frozen waters of Spitzbergen and in the Antarctic seas; that the sharks and seals of various kinds are found in equally innumerable tribes in seas the farthest apart in the two hemispheres; that the turtle and the tortoise inhabit indifferently the Atlantic, the Indian, and the great equinoctial oceans.