File:A system of obstetrics (1888) (14592184750).jpg

Identifier: systemri01hirs (find matches)
Title: A system of obstetrics
Year: 1888 (1880s)
Authors: Hirst, Barton Cooke, 1861-1935
Subjects: Obstetrics
Publisher: Philadelphia, Lea brothers & co.
Contributing Library: Yale University, Cushing/Whitney Medical Library
Digitizing Sponsor: Open Knowledge Commons and Yale University, Cushing/Whitney Medical Library

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orous movements of the foetus;or (3) by the development of hut a Bingle amnion from the very beginning (Myschkin,Vvreh. Arch., cviii. S. 133, 146).1 Arrh.f. Oyn., Bd. xxix. S. 438. 220 THE FOETUS: ITS PHYSIOLOGY AXD PATHOLOGY. outstrip its fellow in growth, and divert the greater part of the nour-ishment from the mother to itself, thus growing rapidly and encroach-ing so upon the room that should belong to the weaker foetus that thelatter is killed, and finally pressed flat against the uterine wall (foetuspapyraceus). Hydramnion is also very common in twin pregnancies, andoccasionally one foetus is converted into an acardiac monster. If the foe-tuses of a twin pregnancy escape the dangers of intra-uterine life, thereare many perilous complications awaiting them in labor. Should onefoetus die during pregnancy, it is usually retained until term, when theliving and dead children are cast off together, widely differing in ap-pearance and development;! or else one ovum may be aborted at an
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Twins seen on Section of a Woman who died suddenly from Hemorrhage in the last week ofPregnancy (Sippel): a, tear in chorion; bb, bladder and vaginal vault: ce, uterine walls,folded back ; d, fundus uteri. early period of pregnancy, while the other goes on developing tillterm.2 Even though both children have been retained in utero an equallength of time, there is usually a marked difference in their length and 1 Schultze: Volkm. Samml. Mm. Vortrage, No. 34. 2 Sirois: LUnion medicale du Canada, July, 1887; and Warren: Am. Journ. Obstet., THE AMNION. 221 weight, especially if they have resided in one ovum.1 In cases of ute-rus duplex, foetuses of different ages have been found developing in thetwo divisions of the uterus. Fordyce Barker reports a case of deliveryof two mature children from a woman with a double uterus, one male,the other female, at an interval of two months.2 Upon such cases, andalso upon the fact that of twins in negresses rarely one is light and theother dark, showing

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