398 F. B. GUTHRIE AND R. HELMS. 



The following notes were made on August 21st : — The 

 germination was unaffected in pots 145 and 146 ; slightly 

 affected in 147 and more strongly in the remainder. The 

 early growth was slightly affected in pots 145, 146, 147, 

 and more strongly affected in the remaining three. 



On September 29th, the plants in 145, 146, and 147 had 

 recovered and were growing as vigorously as the check- 

 pots ; in No. 118 the growth was strongly affected, in 149 

 the plants were very feeble, and in 150, very nearly dead. 



In order to arrive at the point at which germination was 

 prevented, three more pots were sown on October 10th as 

 follows : — 



No. 151, '4 per cent Na 2 C0 3 

 „ 152, '45 

 ,, loo, '50 ,, ,, 



On October 21st the germination in pot No. 151 was 

 strongly affected; in pot 152 the germination was still more 

 strongly affected, and in pot 153 the plants had hardly 

 germinated at all. By December 4th, 1903, when the pots 

 woe again examined, the plants were all dead. 



It is therefore, concluded that in the case of rye, germin- 

 ation is affected by the presence of "25 per cent. Na 2 C0 3 , 

 and prevented when '5 per cent, is present. *1 per cent. 

 is sufficient to check the early growth of the plant, but 

 under favourable conditions the plants will recover with 

 quantities up to '25 per cent., above this point, however, 

 the subsequent growth of rye is affected, and in the presence 

 *1 per cent, the plants die. 



Experiments with ammonium sirtphocyanide. 



The following pots were prepared and filled with soil as 



usual, manured and sown on August 6th, 1903 : — 



No. 154, '004 per cent. NH 4 CNS. 



„ 155, '005 



,, 156, *006 „ ,, 



,, 15/, *00v „ „ 



„ 158, '008 



