124 



THE MAMMALIAN EGG 



place when she incorporated scrapings of Fallopian-tube mucosa in 

 the medium but not otherwise. Establishment of the conditions 

 required for capacitation in vitro is certainly the next important step 

 to be taken in this field of research. (Other problems relating to the 

 fertilization of mammalian eggs in vitro have recently been discussed: 

 Austin, 1961c.) 



