In the preceding chapter we learned that when the two germ cells came together, there occurred a complete blending of two separate and distinct hereditary lines, reaching from the present away back into the dim and distant past. By the union of these two ancestral strains a new personality is formed, a new individual is created, with its own peculiar characteristics.
HEREDITARY TRAITS
Probably none of the laboriously acquired accomplishments of the present generation can be directly—and as such—handed down to our children. What we are to be and what we will do in this world was largely determined by the laws of heredity by the time we were well started on our development experience en-utero during the third or fourth week of our prenatal existence, as outlined in a former chapter.
It is now generally accepted in scientific circles that acquired characteristics are not transmissible. Someone has aptly stated this truth by saying that "wooden heads are inherited, but wooden legs are not." This does not by any means imply that we do not have power and ability to fashion our careers and carve out our own destiny, within the possible bounds of our hereditary endowment and environmental surroundings. Heredity does determine our "capital stock," but our own efforts and acts determine the interest and increase which we may derive from our natural endowment. From the moment conception takes place—the very instant when the two sex cells meet and blend—then and there "the gates of heredity are forever closed." From that time on we are dealing with the problems of nutrition, development, education, and environment; therefore, so-called prenatal influence can have nothing whatever to do with heredity.
A father may have acquired great talent as a physician or a surgeon, in fact he may hold the chair of surgery in a medical college, but each of his children come into the world without the slightest knowledge of the subject, and, as far as direct and immediate heredity is concerned, will have to work just about as hard to master the subject as will the same average class of children whose parents were not surgeons. This must not be taken to mean that certain abilities and tendencies are not inheritable—for they are; but they are inherited through the parents—and not from them—directly. These transmitted characteristics are largely "stock" traits, and usually have long been present in the "ancestral strain."
MATERNAL IMPRESSIONS
A mother may sing and pray all through the nine months of expectancy, or she may weep and scold, or even curse. In neither case can she influence the spiritual or moral tendencies of her child and cause it, through supposed prenatal influence, to be born with criminal tendencies or to grow up a pious lad or become a devout minister. These tendencies and characteristics are all largely determined by the "depressors," "suppressors," and "determiners" which were present in the two microscopic and mosaic germ cells which united to start the embryo at the time of conception.
The child is destined to be born, endowed, and equipped with the mental, nervous, and physical powers which his line has fallen heir to all through the past ages. Down through the ages education, religion, environment, and other special influences have no doubt played a small part in influencing and determining hereditary characteristics; just as environment in the ages past changed the foot of the evolving horse from a flat, "cushiony" foot with many toes (much needed in the soft bog of his earlier existence) into the "hoof foot" of later days, when harder soil and necessity for greater fleetness, assisted by some sort of "selection" and "survival," conspired to give us the foot of our modern horse, and this story is all plainly and serially told in the fossil and other remains found in our own hemisphere. It would appear that many, many generations of education and environment are required to influence markedly the established and settled train of heredity regarding any particular element or characteristic in any particular line or lines of hereditary tendencies.
EUGENIC SUPERSTITION
There is probably more misinformation in the minds of the people on the subject of "maternal impressions" and "birthmarks" than any other scientific or medical subject. The popular belief that, if a pregnant woman should see an ugly sight or pass through some terrifying experience, in some mysterious way her unborn child would be "marked," deformed, or in some way show some blemish at birth, is a time-honored and ancient belief.