It is important to recognize that there is nothing mysterious in the method of science, or apart from the ordinary routine of life. Science has been defined as the habit or faculty of observation. By such the child grows in knowledge, and in its daily exercise an adult lives and moves. Only a quantitative difference makes observation scientific—accuracy; in that way alone do we discover things as they really are. This is the essence of Plato's definition of science as "the discovery of things as they really are," whether in the heavens above, in the earth beneath, or in the observer himself. As a mental operation, the scientific method is equally applicable to deciphering a bit of Beneventan script, to the analysis of the evidence of the Commission on Coal-Mines, a study of the mechanism of the nose-dive, or of the colour-scheme in tiger-beetles. To observation and reasoned thought, the Greek added experiment, but never fully used it in biology, an instrument which has made science productive, and to which the modern world owes its civilization. Our every-day existence depends on the practical application of discoveries in pure science by men who had no other motives than a search for knowledge of Nature's laws, a disinterestedness which Burnet claims to be the distinctive gift of Hellas to humanity. With the discovery of induced currents Faraday had no thought of the dynamo. Crookes's tubes were a plaything until Roentgen turned them into practical use with the X-rays. Perkin had no thought of transforming chemical industry when he discovered aniline dyes. Priestley would have cursed the observation that an electrical charge produced nitrous acid had he foreseen that it would enable Germany to prolong the war, but he would have blessed the thought that it may make us independent of all outside sources for fertilizers.
The extraordinary development of modern science may be her undoing. Specialism, now a necessity, has fragmented the specialities themselves in a way that makes the outlook hazardous. The workers lose all sense of proportion in a maze of minutiæ. Everywhere men are in small coteries intensely absorbed in subjects of deep interest, but of very limited scope. Chemistry, a century ago an appanage of the Chair of Medicine or even of Divinity, has now a dozen departments, each with its laboratory and literature, sometimes its own society. Applying themselves early to research, young men get into backwaters far from the main stream. They quickly lose the sense of proportion, become hypercritical, and the smaller the field, the greater the tendency to megalocephaly. The study for fourteen years of the variations in the colour-scheme of the thirteen hundred species of tiger-beetles scattered over the earth may sterilize a man into a sticker of pins and a paster of labels; on the other hand, he may be a modern biologist whose interest is in the experimental modification of types, and in the mysterious insulation of hereditary characters from the environment. Only in one direction does the modern specialist acknowledge his debt to the dead languages. Men of science pay homage, as do no others, to the god of words whose magic power is nowhere so manifest as in the plastic language of Greece. The only visit many students pay to Parnassus is to get an intelligible label for a fact or form newly discovered. Turn the pages of such a dictionary of chemical terms as Morley and Muir, and you meet in close-set columns countless names unknown a decade ago, and unintelligible to the specialist in another department unless familiar with Greek, and as meaningless as the Arabic jargon in such mediæval collections as the "Synonyma" of Simon Januensis or the "Pandects" of Matheas Sylvaticus. As "Punch" put it the other day in a delightful poetical review of Professor West's volume: [14]
"Botany relies on Latin ever since Linnæus' days;
Biologic nomenclature draws on Greek in countless ways;
While in Medicine it is obvious you can never take your oath
What an ailment means exactly if you haven't studied both."
[ [14] The Value of the Classics. Princeton University Press, 1917.
Let me give a couple of examples.
Within the narrow compass of the primitive cell from which all living beings originate, onomatomania runs riot. The process of mitosis has developed a special literature and language. Dealing not alone with the problems of heredity and of sex, but with the very dynamics of life, the mitotic complex is much more than a simple physiological process, and in the action and interaction of physical forces the cytologist hopes to find the key to the secret of life itself. And what a Grecian he has become! Listen to this account, which Aristotle would understand much better than most of us.
The karyogranulomes, not the idiogranulomes or microsomenstratum in the protoplasm of the spermatogonia, unite into the idiosphærosome, acrosoma of Lenhossék, a protean phase, as the idiosphærosome differentiates into an idiocryptosome and an idiocalyptosome, both surrounded by the idiosphærotheca, the archoplasmic vesicle; but the idioectosome disappears in the metamorphosis of the spermatid into a sphere, the idiophtharosome. The separation of the calyptosome from the cryptosome antedates the transformation of the idiosphærotheca into the spermiocalyptrotheca. [15]
[ [15] Of course I have made this up out of a recent number of the American Journal of Anatomy, 24, I.
Or take a more practical if less Cratylean example. In our precious cabbage-patches the holometabolous insecta are the hosts of parasitic polyembryonic hymenoptera, upon the prevalence of which rests the psychic and somatic stamina of our fellow countrymen; for the larvæ of Pieris brassicæ, vulgarly cabbage butterfly, are parasitiased by the Apantales glomeratus, which in turn has a hyperparasite, the Mesochorus pallidus. It is tragic to think that the fate of a plant, the dietetic and pharmaceutical virtues of which have been so extolled by Cato, and upon which two of my Plinean colleagues of uncertain date, Chrysippus and Dieuches, wrote monographs—it fills one with terror to think that a crop so dear to Hodge (et veris cymata! the Brussels sprouts of Columella) should depend on the deposition in the ovum of the Pieris of another polyembryonic egg. The cytoplasm or oöplasm of this forms a trophoamnion and develops into a polygerminal mass, a spherical morula, from which in turn develop a hundred or more larvæ, which immediately proceed to eat up everything in and of the body of their host. Only in this way does Nature preserve the Selenas, the Leas, and the Crambes, so dear to Cato and so necessary for the sustenance of our hard-working, brawny-armed Brasserii.
From over-specialization scientific men are in a more parlous state than are the Humanists from neglect of classical tradition. The salvation of science lies in a recognition of a new philosophy—the scientia scientiarum of which Plato speaks. "Now when all these studies reach the point of intercommunion and connection with one another and come to be considered in their mutual affinities, then, I think, and not till then, will the pursuit of them have a value." Upon this synthetic process I hesitate to dwell; since, like Dr. Johnson's friend, Oliver Edwards, I have never succeeded in mastering philosophy—cheerfulness was always breaking in.