194 F. B. GUTHRIE AND R. HELMS. 



Notes were made of the appearance of these pots on 

 July 24th, and again on August 26th. 



No. 16 had germinated well and growing well (heads are 

 forming, Oct. 8th.) 



No. 17, germination slightly retarded, but recovered and 

 was growing well. 



No. 18, germination considerably affected, poor in appear- 

 ance (July 24th) but recovered and growing well 

 (Aug. 26th). 



No. 19, germination much affected, growth very feeble. 

 Plants dead August 26th. 



A further set of pots was resown on July 28th with the 

 following quantities of salt : — 



Pot No. 24, -10 per cent. NaOl 

 » 27, -15 

 „ 30, '20 

 „ 31, '30 



On August 26th these pots presented the following 

 appearance : — 



24, germination retarded. 



27, germination more retarded. 



30, germination very feeble. 



31, very few germinated. 



From the above experiments the following summary of 

 €onclusions is drawn : — *01 to '02 per cent. NaOl is without 

 effect upon the wheat plant, the grain germinating well, 

 and the plants growing vigorously. With *05 to '1Q per 

 cent. NaOl the germination is somewhat retarded, the plants 

 are less vigorous but recover and grow well. With '15 

 the germination is still more affected and the plants would 

 probably not recover under less favourable conditions than 

 those of the experiment. *20 per cent, NaOl in the soil is 

 fatal to the growth of wheat. 



