K. MIYAKE.— INFLUENCE OF THE SALTS ETC. 



225 



7 beakers received 1/10 N. Na.,SO, 30 cc, 1/10 N. Na 2 SO, 25 cc. 

 + 1/10 N. KoSO, 5 ec, 1/10 N. Na 2 S0 4 20 cc. + 1/10 N. K 2 S0 4 

 10 cc, 1/10 N. Na 2 S0 4 15 cc. + 1/10 N. K 2 S0 4 15 cc, 1/10 N. 

 Na 2 S0 4 10 cc. + 1/10 N. K 2 S0 4 20 cc, 1/10 N. Na 2 S0 4 5 cc + 

 1/10 N. K 2 S0 4 25 cc. and 1/10 N. K 2 S0 4 30 cc. respectively, 

 while 1 beaker containing distilled water served as control. 

 On February 1st (1913), young rice seedlings which were grown 

 in distilled water, were transplanted into the beakers, each re- 

 ceiving five healthy individuals of uniform size (about 20 mm 

 long) and kept in a green house. The evaporated water was 

 supplemented with distilled water from- time to time to keep the 

 solutions always in their initial concentrations. A decided 

 difference in plant growth was noticed from day to day. On 

 February 18th, the measurement was made with the following 

 result : 



Solutions used 



Length 

 of leaf 



Length 

 of root 



Number 

 of roots 



I / 10 H. Na. 2 S0 4 30 cc. 



mm. 



35 



35 



2* 



1/10 N. Na 2 S0 4 25 cc. + 1/10 N. K 2 S0 4 5 cc. 



67 



43 



6x 



1/10 N. Na 2 S0 4 20 cc. + 1/10 N. K. 2 S0 4 10 cc. 



47 



37 



6x 



1/10 N. Na. 2 S0 4 15 cc. + i/j.0 N. K 2 S0 4 15 cc. 



47 



37 



6x 



1/10 N. Na 2 S0 4 10 cc. + 1/10 N. K 2 S0 4 20 cc. 



47 



35 



6x 



1/L0 N. Na 2 S0 4 5 cc. -f- 1/10 N. K 2 S0 4 25 cc. 



50 



43 



7x 



l/W N. K 2 S0 4 30 cc. 



40 



37 



6x 



Distilled water 30 cc. 



68 



43 



7 



X Only one root was well developed. 



II. Experiment with KaCl and KC1. 



The antagonistic action of sodium and potassium on each 

 other was again established with sodium and potassium chlo- 

 ride in the same manner as in the preceding experiment, and 

 the following result was obtained : 



