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FRANKLIN P. MALL 



not be unduly diluted, but instead there would be a tendency to 

 bring it together again. The ovum would probably be fertiliz- 

 able for fully 24 hours after o\nilation, this time being sufficient 

 to bring it into the outer end of the tube. The following table 

 gives the copulation age of the rat's ovum, according to Huber, 

 and of the dog's, according to Bischoff. I have taken the 

 measurements from their illustrations which are to scale. The 

 third column gives the greatest diameter of the human ovum, 

 with the length of the embryo in the 4th column. The second 

 portion of the table gives the fertilization age for the third week, 

 according to Bryce and Teacher and to Triepel. It will be seen 

 that the former allows 48 hours for fertilization after copulation, 

 a period of time which, in my opinion, is abundantly long. Fi- 

 nally Triepel's column is practically identical with that of Bryce 

 and Teacher. 



TABLE 8 



