WEISMANN'S THEORY OF THE GERMPLA8M 57 



broken up into unlike halves, by which the 

 development of the corresponding cells is directed 



FIG. 3. DIAGRAMS OF THE EGGS OF FROGS, which show how 

 alteration of the cleavage process changes the mode in which the 

 nuclear material is distributed. The nuclei indicated by the 

 same numbers have the same descent in all the diagrams. All 

 the eggs are viewed from the animal pole. A. Normally develop- 

 ing eggs. B. Eggs developing under compression by horizontal 

 plates. C. Eggs developing under compression by vertical plates. 



diversely, i.e., is determined in a specific fashion. 

 The error in these representations of Weismann 



