394 



F. H. Krecker, 



way and these too showed great variations. However in this case 

 none of the pieces was capable of regenerating a head. 



Again on July 6th, 1908, twenty worms were taken. Ten of Lum- 

 hriculus were cut into pieces of 15 somites each and ten of Limnodrilus 

 were cut into pieces each 12 somites long. These were all counted at 

 the end of two and of four weeks respectively with results much the 

 same in kind as given above for the first series. 



The four groups of experiments are summarized in the accom- 

 panying tables. Tables I and II deal with Lumbriculus and III and 

 IV with Limnodrilus. 



From these tables it can be seen that, although there are several 

 cieces at each level which either have the same number of new so- 

 mites or eise differ by one somite only, still, on the whole, there is 

 ponsiderable Variation between the pieces from a given level for a given 



Table I. 



IX— X 



Dead 



* Individual dead. 



