324 



Professor Marshall Ward, On the Question of 



refined and subtle nature which determines such fundamental 

 properties as specific relationship, variation, heredity and other 

 biological phenomena. 



Table VI. 



100 



90 



80 



70 



60 



50 



40 



30 



20 



10 



/ 



/ 



/ 



\ 

 \ 

 \ 





















/ 

 / 

 / 



\ 



\ 

















/ / 



/ / 

 / ' . 



^_ 







/ 



/ 



"v/ 











/ / 



/ / 



/ / 



At 





* \ ' 

 x O 



x>\ 



t 1 



r t 



/} 



w\ 



/if 



k vs. 

 \ vv 



/ / 

 / / / 

 / / / 



1 ' / ' 



/ * 

 / * 

 s 









\\ 



5> 





x \\\ 



/iff , 



V \ 



sf 



/£~ " 









v \ 



/ ^s' 





1 \ 



y / 



.-'\ 





















f / 









































■ 

































*****x 



cq 



K) 



Above = 



Pq 



K) 



Pq 



CQ 



S 



K) 



eq 



Below = 



- - - Infection = x-x-x-x 



Size of stomata (extremes and commonest sizes). First green leaf. 

 The vertical heights are in multiples of 1 fj.. The measurements of stomata 

 are extremes and commonest lengths for both upper and lower surfaces. 



We are, in fact, driven to assumptions such as that the spores 

 of the fungus derived from a given species A of the host-plant are 

 able to attack the species or variety B, but are unable to success- 

 fully infect the species or variety C, because some resisting sub- 

 stance or condition exists in the living cells of G which is absent 



