1 82 



THE BIOLOGY OF STENTOR 



tiilll Ipii liiHlt Isfii lii ^ li 



lii lill! ilil ^iiiiiiiii! liiiii tm m 



Fig. 46. Experiments establishing empirical correlation between 

 primordium formation and loci of stripe-width contrast. 



A. Sector bearing primordium site grafted into back of the 

 host. On excision of mouthparts, primordia are formed both in 



the host's and in the implanted site. 



B. Sector of fine-stripe grafted into wide-stripe area pro- 

 duces extra regeneration primordium on the side with the finest 



stripes. 



