130 



INDUCTION AND ORGANISATION 



of the vitreous hody^ and it also forms several tough membranes 

 around the eye. 



One of the first problems arising in connection with the 

 development of the eye is: What causes the protrusion of the 

 eye- vesicles from the wall of the brain? Experiments in which 



Fig. 48. (a) the right eye primordium is removed from the rostral 

 part of the neural plate of one embryo of Bombinator, and (b) is 

 grafted into the right side of another embryo; (c) cross section 

 of the larva developed from the embryo pictured in (b); an eye-cup 

 (o) has developed from the graft. After Spemann. 



