PRODUCTION OF DOUBLE EMBRYOS I99 



The first cleavage normally occurs 2^ hours after the eggs are inseminated, 

 and the second cleavage follows within 1 hour. It is important that the eggs be 

 inverted immediately after the congiletion of the first cleavage and not later. It 

 would be well, therefore, to segregate eggs inverted at various stages of the first 

 cleavage development to determine the effect of this variable on double monster pro- 

 duction. 



DRAWINGS OF DOUBLE EMBRYOS PBODUCED BY INVERSION 



