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The secretion of the male known as the seed or semen depends for the life-transmitting power upon little minute bodies called spermatozoa. These are very active and numerous in a healthy secretion, being many hundreds in a single drop and a single one of them is capable to bring about conception in a female. Dr.
It weakens the semen; in other words, that this is not so rich in spermatozoa after too frequent indulgence; and when carried to the extent of a debauch, the fiuid ejaculated may be wholly destitute of spermatozoa. Thus it will be seen that it will be much better to husband the resources of both man and wife." The Prevention of Conception and the Limitation of Offspring.
This does not, however, correspond to the time of fertilization. Several days may elapse before the spermatozoa meet with an ovum and fertilize it. In Scotland a child born six months after marriage is legitimate, which is allowing an ample margin. A child may be born alive, but may not be viable, by which is meant that it is not endowed with a capacity of maintaining its life.
The external secretion of the testes differs from the internal secretion in containing spermatozoa; it may be that there are other differences. It is, however, generally believed that one or more of the substances found in the external secretion appear in the internal secretion.
In case of a sterile marriage, the possible cause should first be investigated in the husband, for it is comparatively easy to examine the semen, and to ascertain if it contains active spermatozoa.
The Mendelian theory therefore is that when an ovum has two X sex-chromosomes it can only after a number of cell-divisions, at the following reduction division, give rise to ova, while an ovum containing one X sex-chromosome, or two different, XY, chromosomes, at the next reduction division gives rise to spermatozoa.
Two other masses about the same size or a little larger were found on the sites of the original testes. These also were full of mobile spermatozoa, and must have grown from portions of the testes left behind at castration.
The vasa deferentia were seen as white convoluted threads on the peritoneum, but contained no spermatozoa. On July 29, 1911, a little more than eleven months after the operation, I examined and killed the second of these castrated cocks, the speckled mongrel-bred bird.
You could go on further to illustrate the facts of reproduction by bees and ants, so familiar to children, where the drone or male bee, or the male ant, in just the same way as in the plant, fertilizes the eggs of the queen bee or ant by bringing the spermatozoa into contact with the unfertilized egg in the insect's body, when the eggs thus fertilized are laid and carefully nurtured by the working bee or ant.
By sex here he obviously means the instincts and somatic characters, for sex in the first instance, as we have already pointed out, means the difference between ovary and testis, between ova and spermatozoa. It is difficult to accept all Steinach's results without confirmation, especially those which show that the feminised male is more female than the normal female.
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