THE PRODUCTION OF GRAFTED EMBRYOS. 



75 



EXAMINATION OF THE EFFECT OF THE TREATMENT 



UPON DEVELOPMENT. 



Shaking of the Eggs. When the eggs were shaken about two 

 minutes after fertilization, the fertilization membranes were 

 cast off most of the eggs. When the eggs were shaken four or 

 more minutes after fertilization, the membranes were removed 



FIGS. 1-7. 



with difficulty and the eggs were considerably distorted and 

 otherwise injured. When shaken less than one and a half 



