take place as a rule, 

 in- about an alterati 



tli rough the egg in 

 brought about by tin 



very doubtful, especially when we find that of 47 egg 

 formed even the first cleavage plane and the inclin; 

 these eight eggs in the gum was so obviously influence 

 being 90°, 60°, 50°, 50°, 30°, 20°, 20°, 20°. 



In another part of this paper it is found that fro; 

 drawn out to double their normal diameter in narro 

 tubes assume a conical or else a lens shape, but cleavt 



,„.,«,„,, A<,nin ,wr„« in WoPT tuU'S WOlllldaboUt 1 



position of organs formed or at least the gastrula mouth J 

 however, no reference to the side whence the air supply ca 

 With Pfluger, Roux finds the first cleavage plane is 

 median plane of the frog, yet not without exceptions since 

 normal sequence may be interrupted and the first plane 



