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I cannot even guess the cause of the death of the embryo, but 1 

 observed that the embryo may perish at ditïerent ages. At least I 

 tldnk I have met with a case where tliis occurred on the 8'^' day 

 and with another where this occurred on the 16''' da}-. He who 

 disposes of younger specimina (my youngest embryos were of the 

 end of the '13''' day) probably will also find eggs that have perished 

 before the 8^'' day. Moreover it appears that in one and the same 

 uterus embryos may die away at very diffei-ent ages. I discovered 

 in the same uterus one of the empty egg-chambers with the smallest 

 and one with the greatest quantity of foetal rests, and I conclude 

 that one embryo had been dead a much longer time than the other. 



Leiden. Anatomisch Kabinet. 



