

IOI?] 



CHIEN—SPIROG I RA 



407 



The last named dilution of each salt is the lowest dilution at 

 which contraction appears. CeCl 3 produces contraction of the 

 larger kind only. It is also seen from the table that the lower 



TABLE I 



► 





For the larger kind of Spirogyra 



For the smaller kind of Spirogyra 



* 



Solution 



Time 

 in minutes 



Solution 



Time 

 in minutes 



CeCL 0.005 M 1 8 



Bad* 0.05 jVI 



1-2 



0.001 M 



9 



9 



9 

 10 



4 



5 

 7 



2-5 

 12 



0.01 M 



2-5 

 1 S 



. 0005 M 



0.0001 M 



SrCL 05M 



. 0000 5 M . . . 



2-3 

 3-4 





0.01 M 



BaCl 2 o.oos M 





0.001 M 



O.OOOs M 





SrCl 2 0.01 M 





. 005 M 





A 



\ 





B 



Fig. i. 



normal 



limit of CeCl 3 solution which produces the effect is less than that 

 of the BaCl 2 solution, but the table shows that the effect is pro- 

 duced more rapidly in BaCl 2 and in SrCl 2 than in CeCl 3 . These 



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