In relation to these objections I remark, first those whose experience has been with hale females, I suspect, can have no doubt but that the female organism increases like that of the male, until an emission of fluid of some kind or other takes place. But whether this secretion may properly be called semen, whether any part of it unites with the male semen in forming the rudiments of the foetus, is another question. For my part I am inclined to the opinion that it does not.* I rather regard it as the result of exalted excitation, analogous to the increased secretion of other organs from increased stimulation; and if it may be for any object or use, as it probably is, it is that of affording nature a means of relieving herself; or, in other words, of quieting the venereal passion. If this passion, being once roused, could not by some means or other be calmed, it would command by far too great a portion of our thoughts, and with many constitutions the individuals, whether male or female, could not conduct themselves with due decorum. One fact which leads me to think that the female secretion in the act of coition is not essential to impregnation is, that many females have conceived, if their unbiased testimony may be relied on, when they experienced no pleasure. In these cases it is more than probable that there was no orgasm, nor any secretion or emission of fluid on the part of the female.
* With regard to this secretion in the female, which has
nothing of a seminal character, Dr. Carpenter observes: "Its
admixture with the male semen has been supposed to have some
connection with impregnation; but no proof whatever has been
given that any such admixture is necessary."—"Human
Physiology," p. 991.—G. R.
As to the objection of the supposed impossibility of unorganized matter forming an organized being, I do not believe such a thing takes place, even if we admit that "the original formation of the foetus is a combination of particles of matter derived from each of the parents." What do, or rather what ought we to mean by organized matter? Not, surely, that it exhibits some obvious physical structure, unlike what is to be found in inorganic matter, but that it exhibits phenomena, and of course may be said to possess properties unlike any kind of inorganic matter. Matter unites with matter in three ways, mechanically, chemically and organically, and each mode of union gives rise to properties peculiar to itself. When matter unites organically, the substance or being so formed exhibits some phenomena essentially different from what inorganic bodies exhibit. It is on this account that we ascribe to organic bodies certain properties, which we call physiological properties, such as contractility, sensibility, life, etc. When, from any cause, these bodies have undergone such a change that they no longer exhibit the phenomena peculiar to them, they are said to have lost these properties, and to be dead. A substance need not possess all the physiological properties of an animal of the higher orders to entitle it to the name of an organized or living substance, nor need it possess the physical property of solidity. The blood, as well as many of the secretions, does several things, exhibits several phenomena, which no mechanical or mere chemical combinations of matter do exhibit. We must therefore ascribe to it certain physiological properties, and regard it as an organized, a living fluid, as was contended by the celebrated John Hunter. So with respect to the semen, it certainly possesses physiological properties, one in particular peculiar to itself, namely, the property of impregnating the female; and upon no sound principle can it be regarded in any other light than as an organized, and of course a living fluid. And if the female secretion or any part of it unite with the male secretion in the formation of the rudiments or the foetus in a different manner than any other substance would, then it certainly has the property of doing so, whether we give this property a name or not; and a regard to the soundest principles of physiology compels us to class this property with the physiological or vital, and of course to regard this secretion as an organized and living fluid So, then, unorganized matter does not form an organized being, admitting the hypothesis before us as correct.
That organized being should give rise to other organized beings under favorable circumstances as to nourishment, warmth, etc., is no more wonderful than that fire should give rise to fire when air and fuel are present. To be sure, there are some minute steps in the processes which are not fully known to us; still, if they ever should be known, we should unquestionably see that there is a natural cause for every one of them; and that they are all consonant with certain laws of the animal economy. We should see no necessity of attempting to explain the process of generation by bringing to our aid, or rather to the darkening of the subject, any imaginary principle, as the visus formaticus of Blumenbach.
As to the "observations and experiments of Haller and Spallanzani," I think, with Dr. Bostock, that they weigh but little, if any, against the theory before us. I shall not be at the labor of bringing them forward and showing their futility as objections to this theory, for I am far from insisting on the correctness of it; that is, I do not insist that any part of the female secretion, during coition, unites with the male semen in the formation of the rudiments of the foetus.
The second hypothesis or theory, I shall notice, as to the rudiments of the foetus, is that of Leeuwenhoek, who regarded the seminal animalculse of the male semen as the proper rudiments of the foetus, and thought that the office of the female is to afford them a suitable receptacle where they may be supported and nourished until they are able to exist by the exercise of their own functions. This is essentially the view of the subject which I intend to give more particularly presently.
I know of no serious objections to this hypothesis, nothing but the "extreme improbability," as its opponents say, "that these animalculæ should be the rudiments of being so totally dissimilar to them." But I wish to know if there is more difference between a foetus and a seminal animalcule than there is between a foetus and a few material particles in some other form than that of such animalcule?
The third hypothesis, or that of pre-existing germs, proceeded upon a precisely opposite view of the subject to that of Leeuwenhoek, namely, that the foetus is properly the production of the female; that it exists previous to the sexual congress, with all its organs, in some parts of the uterine system; and that it receives no proper addition from the male, but that the seminal fluid acts merely by exciting the powers of the foetus, or endowing it with vitality.
It is not known who first proposed this hypothesis; but strange as it may appear, it has had the support of such names as Bonnet, Haller and Spallanzani, and met with a favorable reception in the middle of the last century. Agreeable to this hypothesis, our common mother, Eve, contained a number of homuncules (little men) one within another, like a nest of boxes, and all within her ovaries, equal to all the number of births that have ever been, or ever will be, not to reckon abortions. Were I to bring forward all the facts and arguments that have been advanced in support of this idea, it seems to me I should fail to convince sound minds of its correctness; as to arguments against it, they surely seem uncalled for. Having now presented several hypotheses of generation, some as to the manner in which the semen reaches or influences the ovary, and others as to the rudiments of the foetus, I shall now bring together those views which, upon the whole, appear to me the most satisfactory.
I believe, with Dr. Dewees, that a set of absorbent vessels extend from the innermost surface of the labia externa, and from the vagina to the ovary, the whole office of which is to take up the semen or some part thereof, and convey it to the ovary. I believe, with Leeuwenhoek, that the seminal animalculæ are the proper rudiments of the foetus, and are perhaps of different sexes; that in cases of impregnation one of them is carried not only to, but into a vesicle of an ovary, which is in a condition to receive and be duly affected by it.* It is here surrounded by the albuminous fluid which the vesicle contains. This fluid being somewhat changed in its qualities by its new-comer, stimulates the minute vessels of the parts which surround it, and thus causes more of this fluid to be formed; and while it affords the animalcule material for its development, it puts the delicate membrane of the ovary which retains it in its place upon the stretch, and finally bursts forth surrounded probably by an exceedingly delicate membrane of its own. This membrane, with the albuminous fluid it contains and the animalcule in the center of it, constitutes the ovum or egg. It is received by the fimbriated extremity of the Fallopian tube, which by this time has grasped the ovary, and is by this tube slowly conveyed into the uterus, to the inner surface of which it attaches itself, through the medium of the membrane, which is formed by the uterus itself in the interim between impregnation and the arriving of the ovum in the way I have just mentioned.