24 HIM.W MACMA HKTICrLK IX XOHMAI. AND I'ATIini.ofUf AT. ni;VKT,(M'MK\T. 



destroyed early in development, in which case the magma may dissolve, but some- 

 times it increases fj;reatly in (luantity, forming a gelatinous mass. Freciuently 

 pathological ova are encountered in which the devel()])nient of the embryo is re- 

 tarded, and the amnion is often found filled with a flaky deposit that, as time goes 

 on, increases greatly in quantity and finally forms large crusts which invest the 

 embryo. In other cases there is marked hydramnios, and in certain instances, 

 where \hv anniion is destroyed, the magma dis.solves, leaving only the eml)ryo 

 floathig in tlu- fluid encircled by the chorionic wall. Specimens are also found in 

 which the cavity of the amnion is greatly enlarged and is filled with a jelly-like sub- 

 stance, which in later stages may form crusts encircUng the embryo. The tiuc 

 relation between the pathological changes of the contents of the exoccelom and of 

 the cavitv of the anmion remains to be determined. 



