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The Gastraea itself has originated from the simple multicellular vesicle, the Blastaea, and this in turn must have been evolved from the lowest circle of unicellular animals, to which we give the name of Protozoa. We have already considered the most important primitive type of these, the unicellular Amoeba, which is extremely instructive when compared with the human ovum.
Excessive massage will throw the ovum out. All these are factors in the sterility problem, with its psychic resonances affecting the maternal instinct. There have been created high odes to an unknown god, sensuous lyrics of love, apostrophes and addresses to every human passion. But no poet, to my knowledge, has risen to the heights of the maternal instinct.
On the other hand, it must not be forgotten that there are many natural safeguards against accident: to mention only one, the uterus is ingeniously swung in the abdominal cavity so as to afford a large measure of protection against mechanical shock. Usually, the provisions nature has made are sufficient to resist forces from without which tend to dislodge the ovum.
It may perhaps be said that though it is itself female, it has some property or factor which when united with a sperm causes the zygote to be capable of producing only sperms, and conversely the female ovum has a quality which causes the zygote to produce only ova.
STERILITY IN FEMALES. Sterility in the female is sometimes caused by a morbid adhesion of the tube to a portion of the ovary. By what power the mouth of the tube is directed toward a particular portion of an ovary, from which the ovum is about to be discharged, remains entirely unknown, as does also the precise nature of the cause which effects this movement.
The fertilizing cells are produced in every male from a special tissue, which greatly develops at maturity when the fertilizing cells are matured and are capable of uniting with the ovum to produce the new being.
The red-eyed vireo, on the other hand, though having apparently an easier task than the latter, in the lesser depth of her pensile nest, commonly abandons it altogether to the unwelcome speckled ovum always, I believe, if the cow-bird has anticipated her own first egg.
Harvey thought that impregnation influenced the female organism as a contagion; and that the blood, which he conceived to be the first rudiment of the germ, arose in the clear fluid of the "colliquamentum" of the ovum by a process of concrescence, as a sort of living precipitate.
Indeed, there is nothing more extraordinary in the supposition that the impregnate ovum has an intense sense of its continuity with, and therefore of its identity with, the two impregnate ova from which it has sprung, than in the fact that we have no sense of our continuity with ourselves as infants.
Drop out my father's and mother's lives between the dates of their being impregnate ova and the moment when I became an impregnate ovum.
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