Chapter XIX, 



. PAETUEITION. 



The Period of Gestation — Signs op Approaching Parturition — Natural 

 Parturition — Expulsion op the Placenta — Unnatural Presentations 

 op Various Kinds — Betained After - Birth. 



Fig. 1080.— Fetus of the Cow, with Its Envelops. 



a,.Cotyledons of the placenta ; b, b, Chorion with the allantois covering its inner face ; 

 c, c, Amnion, which secretes the fetal waters ; d, Fetus. 



THE period of gestation in the cow is forty weeks, or about nine 

 calendar months, though it may fall a little short of this time, 

 or exceed it by a little. Dr. C. A. Meyer observes that the 

 result of his observation places the period at nine months and ten 



(817) 



