LOCALIZED ANOMALIES IN HUMAN EMBRYOS 



67 



at the end of pregnancy. In other words, all pathological speci- 

 mens, either with or without localized anomalies, abort in the 

 first half of pregnancy ; while nearly all so-called normal embryos 

 with slight malformations are also aborted before the middle of 

 pregnancy, very few of them reaching full term. 



We have made an especial effort to collect specimens of full 

 term monsters as well as abortion material from all months of 

 pregnancy. Only the first 100 specimens of the collection show 

 an unusually large percentage of normal embryos. Although 

 at first an effort was made to collect only good normal specimens 

 the last 900 specimens, including all sorts of material, of the 

 collection carry about the same percentage of normal speci- 

 mens throughout. The first 1000 specimens of our collection 

 is short of fetuses from the second half of pregnancy, but we 

 are now endeavoring to collect material covering all months of 



