To return to the rôle played by the germ in the question of heredity, we repeat that the physical germ, of itself alone, explains only a portion of man; it throws light on the physical side of heredity, but leaves in as great darkness as ever the problem of intellectual and moral faculty. If it represented the whole man, one would expect to find in any individual the qualities manifested in his progenitors or parents—never any other; these qualities could not exceed the amount possessed by the parents, whereas we find criminals from birth in the most respectable families and saints born to parents who are the very scum of society. You may come across twins, i.e., beings born from the same germs, under the same conditions of time and environment, one of whom is an angel and the other a demon, though their physical forms closely resemble each other.
Child prodigies are sufficiently numerous to frequently trouble the thinker with the problem of heredity. Whence came that irresistible impulse towards poetry in Ovid which showed itself from his earliest youth and in the end overcame the vigorous opposition of his parents?
Pascal in his youth met with keen opposition from his parents, who forbade him to think of mathematics and geometry. He besought his father to tell him, at all events, "what was that science of which he was forbidden to think, and what it treated of." The answer was given to him that "it is the method of making correct figures and finding out the proportions they bear to each other." With nothing more than this information and the aid of reflection, he discovered for himself the first thirty-two propositions of Euclid by means of "circles and lines" traced in secret.
Mozart, at the age of three, learnt the clavecin by watching his sister play; a year afterwards he composed admirably, at the age of seven he played the violin at first sight without having had any teacher, and proved himself a composer of genius before he reached his twelfth birthday.
Pepito Ariola, the little Spaniard, was only three years of age when, about ten years ago, he filled with astonishment the Court of Madrid by his wonderful playing on the piano.
In the lineage of these prodigies has there been found a single ancestor capable of explaining these faculties, as astonishing as they are premature? If to the absence of a cause in their progenitors is added the fact that genius is not hereditary, that Mozarts, Beethovens, and Dantes have left no children stamped from birth as prodigies of genius, we shall be forced to the conclusion that, within the limits it has taken up, materialism is unable to explain heredity.
A few more words must be said on physical heredity to explain why moral qualities in men of average development are often on a par with the same in their parents.
In reality, the physical germs only multiply the organic elements of the ovule, and as this latter contains the cell-types of all the tissues, it follows that these cell-types will possess the qualities of the tissues that exist in the parents. For instance, germs of sufferers from arterio-sclerosis will supply a vascular apparatus predisposed to arterio-sclerosis; tuberculous subjects will supply germs in which the vital vibrations and cellular solidity will be below the normal, and bring about those degenerate tendencies which characterise the tuberculous subject; those of sanguine constitution will transmit a faculty for vital assimilation and considerable corpuscular production, and so on.[72]
In this transmission there are two main factors: the male and the female germs. The former represents force, it imprints on the ovule the initial vital vibration which is to be that of each of the cells of the organism in course of construction. The function of this germ may be studied more easily in animals, because their heredity is not complicated by the individual differences due to the mental vehicle. The stallion supplies the vital qualities—the blood, i.e., the vivacity, brio, pace; physical resistance comes from the mare. To sum up, the modalities of matter are supplied by the feminine germ.
Peculiarities of form proceed from several causes. Phrenology and physiognomy are sciences, though the studies hitherto known by these names are almost valueless because they have not been carried on with the necessary scientific precision. Doubtless Gall and Lavater possessed the gift of penetrating both mind and heart, as was also the case with Mlle. Lenormand Desbarolles and the genuine graphologists; but this gift was not the result of mathematical deduction, but rather a psychometric or prophetic faculty; for this reason neither they nor their books have produced pupils worthy of the name. The main features and lines only of the human form have a known meaning—and not always a very precise one—for every physical, passional, mental, or spiritual force possesses an organ of expression in the visible body, and the varieties of form of this organ enable one to judge of the degrees of force they express on the earth plane. On this basis, peculiarities of form mainly stand; and the intensity of certain defects or qualities is at times expressed so strongly that it completely modifies the tendencies it would seem that heredity ought to pass on. The similarity of form between parent and child is not exact, because it proceeds from the peculiarities of the individual in incarnation far more than from the collective tendencies of the embryonic cells in process of proliferation.