198 



STUDIES ON PATHOLOGIC OVA. 



endeavoring to collect material covering all months. One monster at term, a 

 sympus belonging in about the third 100, was not recorded in our catalogue, and 

 should be added to the four full-term specimens given in table 10. This means that 

 among 1,001 specimens there were 5 full-term monsters, while among 1,000 speci- 

 mens there were 71 with localized anomalies, most of them being aborted early 

 in pregnancy. 



TABLE 11. Localized anomalies in pathological embryos. 



According to the table on the frequency of abortions, given in my monograph 

 on monsters (Mall, 1908), there are 20 abortions to every 80 full-term births; 

 therefore, the 1,000 abortions under consideration were probably derived from 

 5,000 pregnancies. 



As we have calculated that there should be approximately 30 full-term mon- 

 sters in 5,000 pregnancies, and as 5 of these were observed in our 1,000 specimens, 

 it is apparent that the remaining 25 should be encountered in 4,000 additional 

 full-term births. When these figures are considered in connection with the fact 

 that 75 localized anomalies occurred in 1,000 abortions (7.5 per cent) it becomes 

 apparent that in any similar numbers of abortions localized anomalies should 

 occur twelve times as frequently as monsters at term. A similar result is obtained 

 if the number of localized anomalies of the tenth month, as given in table 10, is 

 compared with all of the localized anomalies of previous months, as given in the 

 same table. 



