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.