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.