METHOD OF OPERATION 125 



with the cytoplasm to produce the structures and functions 

 shown in daily life (Figure 20). 



Thus in the infusoria the genie substances are separable into 

 three parts. There is the reserve part in the micronucleus 



Figure 20. Diagram showing the separation of the genie substances 

 into three parts, in Paramecium. A. Micronucleus (reserve). B. Macro- 

 nucleus (active). C. Genie materials diffusing into the cytoplasm. 



(Figure 20, A); there is the active part in the macronucleus 

 {B) ; and there are the much modified parts given off by the 

 macronucleus into the cytoplasm (C). 



Just before conjugation occurs this large active nucleus, the 

 macronucleus, breaks up and disappears (Figure 21). Pieces 

 of it are seen in the cytoplasm; these gradually become 

 smaller and are absorbed. This absorption of pieces of the 

 nucleus by the cytoplasm presumably affects the nature of the 

 cytoplasm. There is then left but the single micronucleus. 

 This then divides and the two conjugating individuals ex- 

 change halves in the way before described. 



Look now at the relation between the characters acquired 

 through the action of changed environmental conditions, and 

 these genie materials. The acquired characters are the result 

 of modifications of genie materials. But of what genie mate- 

 rials ? Of the reserves, in the micronucleus } Or of the active 

 ones, in the macronucleus ? Or of the altered genie products 



