182 THE BOTANICAL MAGAZINE. IVoi. xxvn. No. 82L 



Summary. 



From these two experiments we may safely conclude as 

 follows : 



1. The alkali salts under examination act as an agent both 

 toxic and stimulating upon the growth of rice seedlings, 

 according to their concentrations. 



2. The toxic concentration of magnesium sulphate and chlo- 

 ride, calcium chloride, sodium chloride and carbonate are 



greater than normal while sodium sulphate and bi- 



carbonate are greater than -^— - normal. 



OU 



3. The highest stimulation attains in the dilution of 



500 



normal magnesium sulphate, nn 7r - nnn normal mag- 



1UU0 ouUU 



nesium chloride, normal calcium chloride, 



1000 5000 



So— 356" normal sodinm chloride ' Too — 550 normal 



sodium carbonate and bicarbonate. 



CHEMICAL LABORATORY, COLLEGE OF AGRICULTURE, 



TOHOKU IMPERIAL UNIVARSITY. SAPPORO, JAPAN. 

 JUNE 1913. 



