144 



LIBBIE H. HYMAN 



to cut a large number of pieces ac, and at different intervals 

 after this operation to cut oft" pieces ab from the anterior ends of 



Fig. 23 Seini-diagiiunmatic figure of Jjuinl)riculus inconstans.to show levels 

 of section. 



the ac pieces. These ab pieces are then allowed to regenerate, 

 and it is found that the percentage of normal heads produced 



