19() 



THE HOTAMCAL MAGAZINE. 



[Vol. XXVII. NO, 322. 



I. Experiment with NaCl and MgCl?. 



The antagonism between sodium and magnesium chloride 

 was established with }^oung rice seedlings, about 10 mm. high, 

 which were grown in distilled water from seeds of almost 

 uniform size and specific gravity (1.185-1.120). Beakers of 

 about 5.5 cm. diameter and 7 cm. deep, each containing 30 cc 



of 



" N. NaCl 1 ': 25 cc of ^ N. NaCl + 5 cc of - 1 



K) 



10 



20 cc of -y^r N. iVaCV+lOcc of 



10 



N. MgCL 



10 



15 cc of 



X. MgCL, 



1_ 



10" 



N. NaCl+15 cc of-=r N. MgCl 2 , 10 cc of ] 



10 

 A- N. MgCL, 5ccof^- 



N. 



10 

 N. NaCl+ 25 cc of 



NaCl+ 20 cc of 

 ±- N. MgCL, 



30ccof — — N. MgCk and 30 cc of distilled water (as control) 



respectively were used for the experiment, the seedlings being 

 placed in the culture fluids on Nov. 19th (1912). Five seed- 

 lings were grown in each culture in the green house and the 

 evaporated water was supplemented with distilled water from 

 time to time to keep solutions always in their initial dilutibns. 

 After 12 days, the difference in development in the respective 

 cultures was very remarkable : the following determination 

 was made : 



Solutions used 



Length 



of leaf 



Length 

 of root 



Number 



of roots 





in in. 



mm 





1/10 N. NuCL30cc. 



38 



25 



1 



1/10 N. NaCl 25 cc. + 1/10 N. MgCk 5 cc. 



57 



40 



6* 



L/10 N. NaCl 20 cc. +1/10 N. MgCk 10 cc. 



53 



30 



4x 



l/lo X. NaCl 15 cc + 1/10 N MgCk L5 gc. 



50 



32 



3x 



1/10 N. NaCl 10 cc. +1/10 N. MgCk 20 cc. 



45 



28 



2x 



1 / 1 ( j N. Na ( '/ 5 cc .+ 1/10 N. MgCk 25 cc 



45 



20 



1 



L/10 X. MgCl 2 30cc. 



42 



20 



1 



Distilled water MO cc. 



50 



80 



6 



X Only une root was well developed. 



\) As already proved in the previous paper, a pure solution of each sail to hv tested 

 is very injurious upon I li" growth of rice seedlings iu the concentration of l 10 normal. 



