davenport: processes concerned in ontogeny. 197 



IIP. Processes affecting tiuo or more layers. 



8. Concrescence, p. 191. 



a. of free edges. 



b. of surfaces. 



c. of edges of folds. 



9. Perforation, p. 192. 



IV. Processes occurring in protoplasmic masses. 

 IV*. Effecting especially change of volume, 



1. Excessive growth of particular parts, p. 192. 



b. general. 



c. local. 



IV*. Effecting especially change oi form. 



2. Rearrangement of nuclei, p. 193. 



3. Vacuolization, p. 194. 



4. Dispersion of elements, p. 194. 



IV. Effecting especially change in number, 



5. Constriction, p. 194. 



6. Splitting, p. 195. 



7. Fusion, p. 195. 



The processes here ennumerated may be for the most part grouped 

 under three general heads : — 

 I. Taxic processes. 

 II. Tropic processes. 



III. General growth processes. 



Under Taxic Processes I include such as are accompanied by free 

 migration of protoplasmic bodies, or by the flowing of protoplasm from 

 one part of the whole body to another part. 



Under Tropic Processes I include such differential growth processes 

 as result in a turning of protoplasmic bodies (threads or folds) towards 

 one another or towards another protoplasmic body. 



By General Groicth Processes I mean those differential growth pro- 

 cesses which are not included under tropic processes. 



To the category ' ' taxic processes " may be provisionally assigned 

 Nos. I. 1, 2, 3, 4, 5, and 6 ; III. 4 (in part) and 5 (in part), 7 (]), 9 ; 

 IV. 2, 4, 5, 6, 7. 



To the category " tropic processes " may be assigned Nos. II. 1, 2, 3, 

 4 ; III. 8, 9. 



To the category "general growth processes " may be assigned Nos. III. 

 1, 2, 3, 4 (in part) and 5 (in part), 6 ; IV. 1 and 3. 



