i9o8] OSTERHOUT— ACTION OF MAGNESIUM AND POTASSIUM 119 



A large Spirogyra of the majuscula type was used for experiments 

 with the stronger solutions. The results are given in Table III. 



TABLE III 



Fresh- WATER Algae 



All quantities given are cubic centimeters of .0937W 



solutions 







The plus sign indicates that the plants were alive at the end of the 

 experiment. 



A series of experiments was next made with 

 the gemmae of Lunularia. These were allowed 

 to float on the surface of the solutions. A 

 large number was used and the average results 

 given in the following table. 



TABLE IV 



Liverworts 



All quantities given are cubic centimeters of .0937W 



solutions 



) 



2 3 



The plus sign indicates that the plants were alive at the end of the 

 experiment. 



Fig. I. — Growth 

 of Vaucheria during 

 45 days in . 01m solu- 

 tions. I, KCl, gain 

 o; 2, ioqcc KCl 

 -I-40CC MgClj, gain 

 4200%; 3, MgCla, 

 gain o. X 25. 



