376 



ELIOT R. CLARK 



Fig. 16 Successive drawings of the same growing lymphatic sprout in the 

 dorsal fin expansion of the tail of a hyla pickeringii larva, to show the move- 

 ments of the nuclear areas. Each of the numbers, 1 to 7, indicates the same 

 nuclear area, which is dotted, in successive observations. In case of the division 

 of a nucleus, the daughter areas are indicated as l a and l h . Enlarged 180 times. 



