File:A textbook of obstetrics (1898) (14594028468).jpg

Identifier: textbobstet00hirs (find matches)
Title: A textbook of obstetrics
Year: 1898 (1890s)
Authors: Hirst, Barton Cooke, 1861-1935
Subjects: Obstetrics
Publisher: Philadelphia : Saunders
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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he loweranimals, and upon the clinical history of those pregnancies inwhich the ovum is developed in an unnatural situation. Thus itis argued that the spermatic particle must penetrate the ovuleshortly after its escape from the Graafian follicle, for the occa-sional occurrence of abdominal and tubal pregnancies provesthat the so-called spermatozoa can make their way far into thetube and even on to the surface of the ovary ; and what is seenin animals, makes it probable at least that the outer coating ofthe ovule, during its passage through the tube, receives an addi-tional thickness from an albuminous deposit upon it, or that theoriginal cell-wall becomes denser and more tough by a processof coagulation ; either of which conditions would render thepenetration of the ovule by the spermatic particle unlikely, if not 1 The usual plan of calling the product of conception embryo for the firstthree months, and afterward fetus, is the one adopted here. DEVELOPMENT OF THE EMBRYO AND FETUS. 75
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