42 



ap 



ap ap 



ap ap ap ap ■. j r- u •• i i i 



^ '^ ab cd ef gh ij kl mn op^ 



and so on: 



abcdefghi jklmnop^ 



Germ-plasm. Idioplasm. 



Idioplasm + Germ -plasm = Embryo. 



Diagram of a developing embryo according to Weismann. Method (a). 

 The ids functioning are supposed to consist of 16 determinants : a. -p. 



DIAGRAM No. 2. 

 ap 



ah ip 



ad eh il mp 



ab cd ef gh ij kl mn op 



abcdefghi jklmnop 



Germ-plasm is here represented as equivalent to a determinant. 



Diagram of a developing embryo according to Weismann. Method (b). 

 The ids functioning are supposed to consist of 16 determinants : a. -p. 



Diagram No. 1 illustrates this method ; the ids functioning 

 are supposed to consist of sixteen determinants, represented by 

 the letters a. to p. It will be seen that the zygote a. p. divides 

 into cells, a.p. and a.p^ ; a. p. gives rise to cells exactly similar, 

 and are therefore represented by the letters a.p. ; this series 

 contains Weismann's genii-pldsiii. Cell a.p^ in the first division 





