Au^r. 1919.] 



THE CORRELATION IN THE DIFFERENTIATION. 



159 



5 31 



Table III. Ditto. 0.25 per cent 

 Knop's solution. 



Grown under stronger illumina- 

 tion. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



27 



28 



29 



30 



31 



32 



33 



+ 



- F 



+ 

 + 

 + 



+ F 

 + 



+ II 



+ n 



+ H 



- F 



+ H 



/ 

 3 



5 

 24 

 60 

 21 

 17 

 70 

 12 



3 



O 



15 

 o 



7 

 22 



14 



14 



12 



40 



