MOVEMENTS AND FOLDINGS 



45 



2 1 



^ 5 



Fig. io. — One of Vogt's dye experi- 

 ments, showing the disappearance of 

 the mesoderm through the blastopore. 

 (e) Is a section showing the marks in 

 the mesoderm under the neural plate. 

 (From Diirken, after Vogt.) 



