We are told that Alessandro Volta's wife was ill with fever, and that he, in accordance with the practise of his day, was preparing the usual febrifuge, a broth of skinned frogs; it was a rainy day, and when he hung up the dead frogs on the iron bar of the window, he noticed that their legs contracted. "If dead muscles contract, it must mean that some external force has penetrated them." This was the simple argument of the "genius," the "great discoverer." And seeking this force, Volta, by means of his piles, was able to wrest from the earth electricity, which is, literally as well as figuratively, the "gleam" of an immense progress. Laying due weight upon a little fact, such as that of a dead being having moved, considering it soberly without any fanciful additions, and fixing the mind upon the resulting problem: Why does it move?—such was the lengthy process by which one of the greatest conquests of civilization was achieved.
Akin to this was Galileo's discovery, when, standing in Pisa Cathedral, he watched the oscillations of a hanging lamp. He observed that the oscillations were all completed in the same space of time, and the isochronism of the pendulum was the beginning of the measurement of time for all men, and of the measurement of worlds for the astronomer.
How simple, too, is the story of Newton, who felt an apple fall upon him as he lay under a tree, and thought to himself: "Why did that apple fall?" Such was the simple origin of the theory of the gravity of bodies, and that of universal gravitation.
When we study of the life of Papin, we marvel at the culture which placed him on a level with the most learned men of his times: as physician, physiologist, and mathematician, he was distinguished and honored by the universities of England and Germany. Nevertheless, what gave him his value to humanity, and hence his greatness, was the fact that his attention had been arrested by the sight of the lid of a saucepan of boiling water raised by the steam. "Steam is a force which could lift a piston as it lifts the cover of a saucepan, and become the motor power of a machine." Papin's famous saucepan is a kind of magic wand in the history of mankind, which thenceforth began to work and travel without fatigue. How wonderful are such stories of great discoveries arising from humble beginnings, and working miracles throughout the world!
These, in their origins, resemble those living creatures, born of two imperceptible microscopic cells, the fusion of which inevitably tends to the creation of complex lives. To perceive exactly and to connect the things perceived logically is the work of the highest intelligence. But this work is characterized by a peculiar power of attention, which causes the mind to dwell upon a subject in a species of meditation, the characteristic mark of genius; the outcome is an internal life rich in activities, just as the germinative cells are the fruit of internal existences. It would seem that such mentalities are distinguished from those of the ordinary type, not by their form, but by their "force." It is the vigorous life from which those two small intellectual sparks arise, which makes them so marvelous. If they had not sprung from strong, independent personalities, capable of persistent effort and heroic self-sacrifice, those little intellectual works would have remained as things inert and negligible. Hence all that strengthens the spiritual man may lead him in the footsteps of the genius.
Thus, as regards the intelligence in itself, the work it has to accomplish is a small matter, but it is clearly defined, and stripped of superfluous complications. Simplicity is the guide to discovery; simplicity which, like truth, should be naked. Very little is necessary; but this little must constitute a powerful unity; the rest is vanity.
And the greater this vanity, that is to say, the futile encumbrance of the mind, the more will the light of the spirit be darkened and its forces dissipated, making it difficult or impossible not only to reason and act, but even to perceive reality, to see.
It would be interesting to make a rapid survey of those collective individual errors by which the progress of a new discovery of a simple kind, offering relief to suffering humanity, has been impeded; errors which have even caused persistent denial of the existence of obvious facts, merely because these were not generally known.
Let us consider for a moment the discovery of the cause of malaria. This discovery, due to the Englishman, Ross, in connection with birds, and to the Italian, Grassi, in connection with man, consists in having found out that the plasmodium of malaria, which produces the malady, is inoculated in man and in the various animals subject to it, by a special kind of mosquito. Let us inquire what was the state of science prior to this discovery. In 1880 Laveran had described an animal micro-organism, which preyed upon the red corpuscles of the blood, producing an attack of fever with the cycle of its existence. Subsequent studies confirmed and elucidated this fact, and the plasmodium malariae became a matter of common knowledge. It was known that animal micro-organisms, unlike vegetable micro-organisms, after a cycle of life in which reproduction takes place by scission—that is, by subdivision of a single body into several other bodies equal to the first, give place to sexual forms, masculine and feminine, which are separate, and incapable of scission, but are designed for fusion into one another, after which the organism recommences its cycle of scissions until it again reaches the sexual forms.