No. 6.] PROPORTIONATE STRUCTURES IN STENTOR 313 



B' 



B ; 



B 



C 3 



C 1 



FIG. i. A, contracted stentor to show where the cut was made, a-a ; B, anterior end live 

 hours after the operation; l , an anterior piece thirteen hours after operation ; />' 2 , B3, 

 anterior pieces twenty-four hours after operation ; B*, anterior piece forty-eight hours 

 after the operation. 



C, posterior or foot end of A ; C 1 , posterior end five hours after operation ; C 2 , C 3 , pos- 

 terior ends twenty-four hours after operation. 



