248 



GEORGE T. HARGITT. 



number of irregular cavities. This suggests the possibility of 

 these cavities enlarging and running together, the cells at the 

 same time taking up a regular position next the supporting layer, 

 and thus the cavity of the bud being formed. In neither case, 

 however, would the process necessarily begin at the proximal 

 end. Furthermore, it is not quite certain just how the cavity at 

 the distal end of the bud forms, or why it should form so early 

 and not involve the proximal portion of the bud. 



In regard to the early method of formation of the bud little 

 can be suggested since it has developed beyond the initial stage. 

 It can be said, however, that not the slightest trace of injury was 

 found, which might be a predisposing cause. Alb. Lang l from 



Fir,. 9. 



his work on budding in Hydra, Endcndnmn and Plumularia tried 

 to show that the bud originated from the ectoderm entirely, that 

 the previous view that both layers were active could not be main- 

 tained ; ectoderm cells migrated through the supporting layer and 

 formed the bud entoderm, the old entoderm being absorbed. 

 Seeliger 2 and Braem, 3 however, working on Hydra, Eudendrium, 

 Plumularia, Obelia and Sertularclla claimed that Lang's results 

 were entirely incorrect and the conclusions drawn from them 



1 Zeitschr. f. wiss. ZooL, Bd. 54, 1892, pp. 365-385. 

 * Zeilsckr. f. wiss. ZooL, Bd. 58, 1894, pp. 152-188. 

 3 Biol. Centralbl., Bd. 14, 1894, pp. 140-161. 





