Studies on Regulation. IV. 



123 



strongly oblique (Fig. 33) in order to obtain experimental evi- 

 dence on the question. A few cases from one of these series are 

 described. These cases show that the direction of regeneration 



Fig. 33. 



Fig. 39. 



Fig. 42 



Fig. 34. 



Fig. 35. 



Fig. 40. 



Fig. 41. 



Fig. 45. 



Fig. 43, Fig. 44. 



is not determined, except of course in the early stages, by the sur- 

 face or surfaces from which it occurs. 



