It appears from Galvani’s manuscripts, as examined by Gherardi, that between the years 1772 and 1781 his investigations on irritability, muscular movement, the structure of the ear, the tympanic bone, and the organ of hearing, all belong to the month of April, while his work on cataract belongs to March, and that on the hygiene of sight to January. There seems, therefore, to be here a remarkable predominance for April, though there is less certainty than in the preceding cases.
I imagine the objections that may be made against these conclusions; the scarcity of data, their doubtfulness, the boldness of bringing within the narrow circle of statistics those sublime phenomena of intellectual creation which seem the least susceptible of calculation. Such objections may have weight with those who believe that statistics can only deal with large numbers—perhaps more remarkable for quantity than for quality—and who thrust aside a priori all reasoning on the data, as though figures were not facts, subject like all other facts to synthesis, and had not their true value as materials for the thinker. The facts I have brought forward, though not large, are at all events to be preferred to mere hypotheses, or to the isolated statements of authors, the more so as they are in harmony with these latter, and may at least serve as an encouragement to a new series of fruitful psychometeoric researches.
It may be said also that the creations of genius cannot furnish great columns of figures.
It is very true, however, that in regard to many of them the chronological coincidence is connected with accidental circumstances entirely, independent of the psychic condition. Thus naturalists have greater facilities for observation and experiment in warm months; thus, also, the length and equability of equinoctial nights, the difficulty of making examinations on foggy days, the weariness and discomfort experienced on days that are very hot or very cold, largely account for the predominance of discoveries in spring and autumn.
Yet these are not the only determining circumstances. In the case of anatomists, for example, bodies may be had at all seasons, and principally in winter; and, again, the long and clear winter nights, in which the influence of refraction is less, ought to be as favourable to the astronomers of temperate climates as the warm summer nights of northern climates which give us, however, a greater number of astronomical discoveries.
It is well known, also, that accidental circumstances influence even the phenomena of death, birth, murder, when closely considered statistically. If, however, all these phenomena conduce to the same result, we are led to infer a similar cause common to all, and this can only be found in meteorological influences.
I have grouped together æsthetic creations and scientific discoveries because they are associated by that moment of psychic excitation and extreme sensibility which brings together the most remote facts, the fecundating moment which has rightly been called generative, a moment at which poets and men of science are nearer than is generally supposed. Was there not an audacious imagination in Spallanzani’s experiments, in Herschel’s first attempts, in the great discoveries of Leverrier and Schiaparelli, born of hypothesis, which calculation and observation transformed into axioms? Littrow, speaking of the discovery of Vesta, observes that it was not the result of chance nor of genius alone, but of genius favoured by chance. The star discovered by Piazzi had glimmered in Zach’s eyes, but he, with less genius than Piazzi, or in a moment of less perspicacity, attached no importance to it. The discovery of the solar spots only needed time, patience, and good fortune, remarked Secchi; but it needed genius to discover their true theory. How many learned natural philosophers, observes Arago, in going down a river must have observed the fluttering of the vane at the mast-head, without discovering, like Bradley, the law of aberration. And how many artists, one might add, must have seen hideous heads of porters, without conceiving Leonardo’s Judas, or oranges without creating the cavatina of Mozart’s Don Giovanni.
There is, however, one last objection which seems more serious. Nearly all great intellectual creations, and all discoveries of modern physics, are the results of the slow and continuous meditations of men of science and their predecessors; so that they form a kind of compilation, the chronology of which is not easy to define, because the date at which we are arrested indicates the moment of birth rather than of conception. This objection, however, may be applied to nearly all human phenomena, even the most sudden. Thus, fecundation is a phenomenon which depends on the good nutrition of the organism, and on heredity; insanity, death itself, though apparently produced by sudden, even casual, circumstances, are yet related on one side to the weather and on the other to organic conditions; so that often, one may say, the precise date is fixed at birth.
CHAPTER II.
Climatic Influences on Genius.
Influence of great centres—Race and hot climates—The distribution of great masters—Orographic influences—- Influence of healthy race—Parallelism of high stature and genius—Explanations.