. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 672 UTERUS AND ITS APPENDAGES. whose free ends moving rapidly, cause the whole to rotate. A most remarkable object Fig. Spermatozoa of Lumbricus agricola in motion and forming cilia. (Ad iVai.) is thus formed, which continues for a con- siderable time in motion, clearing for itself a free area, and in this it revolves, whilst its revolutions are apparently assisted by the ac- tion of other spermatozoa, which, having at- tached themselves to the periphery of the cleared space, keep up a perpetual vortex, in which th
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 672 UTERUS AND ITS APPENDAGES. whose free ends moving rapidly, cause the whole to rotate. A most remarkable object Fig. Spermatozoa of Lumbricus agricola in motion and forming cilia. (Ad iVai.) is thus formed, which continues for a con- siderable time in motion, clearing for itself a free area, and in this it revolves, whilst its revolutions are apparently assisted by the ac- tion of other spermatozoa, which, having at- tached themselves to the periphery of the cleared space, keep up a perpetual vortex, in which the central body is partly a passive and partly an active agent.* Whether any similar effect is capable of be- ing produced by the spermatozoa in the human subject, or how far this property may be ge- neral in spermatozoa, I am not aware ; but the circumstance is altogether too remarkable to be passed over without mention here, as it may serve to explain how the onward move- ment of spermatozoa can, in some cases at least, be aided by this peculiar property of the spermatic filaments to attach themselves to surfaces with which they were in contact, and to clothe these surfaces with a fringe of cilia capable of producing the ordinary effects of cilia in motion. The office of the uterus in gestation.— The process of gestation may be considered to commence from the moment that the ovum, which has been subjected to the fertilising in- fluence of the male generative element in the Fallopian tubef, is received impregnated into * These observations were first made by me at the time when the late Dr. Martin Barry announced his discovery of the penetration of the ovum by the spermatozoa in the rabbit, and were communicated to him, and subsequently for publication to Prof. Owen, in whose lectures on the invertebrata this account appears. Lectures on the Comp. Anat. and Phys. of the Invertebrate Animals, by Richard Owen, , 2nd edit. p. 257. t Seep. 009. the uterine cavity. If no su
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