considered by its author as a proof that conception always takes place in this organ." The above quotations are from the third volume of Bostock's Physiology. Now, as the seminal animalculae are essential to impregnation, and as the ovum is impregnated in the ovarium, what more probable conjecture can we form than that an animalcule, as the real proper rudiment of the foetus, enters the ovum, where, being surrounded with albuminous fluid with which it is nourished, it gradually becomes developed? It may be noticed that Leeuwenhoek estimates that ten thousand animalculae of the human semen may exist in a space not larger than a grain of sand. There can, therefore, be no difficulty in admitting that they may find their way along exceedingly minute vessels from the vagina, not only to, but into the ovum while situated in the ovarium. I think no one can be disposed to maintain that the animalculae merely reaches the surface of the ovum and thus impregnates it. But possibly some may contend that its sole office is to stimulate the ovum, and in this way set going that train of actions which are essential to impregnation. But there is no evidence in favor of this last idea, and certainly it does not so well harmonize with the fact that the offspring generally partakes more or less of the character of its male parent. As Dr. Dewees says of the doctrine of sympathy, "It makes no provision for the formation of mules; for the peculiarities of and likeness of parents; and for the propagation of predisposition to disease from parent to child; for the production of mulattoes," etc. Considering it important to do away with the popular and mischievous error that the semen must enter the uterus to effect impregnation, I shall, in addition to what has been already advanced, here notice the experiments of Dr. Haighton. He divided the Fallopian tubes in numerous instances, and that after the operation a foetus is never produced, but that _corpora lutea_ were formed. The obvious conclusions from these facts are that the semen does not traverse the Fallopian tubes to reach the ovaria; yet, that the ovum becomes impregnated while in the ovarium and, consequently, that the semen reaches the ovum in some way, except by the uterus and Fallopian tubes. I may remark, however, that a _corpus luteum_ is not positive proof that impregnation at some time or other has taken place; yet they are so rarely found in virgins that they were regarded as such proofs until the time of Blumenbach, a writer of the present century.*