AMMONIUM SALTS UPON PLANTS. 



2/1 



Continued. 



o.i% 

 Sodium 

 carbonate. 



A 



The old leaves killed. 



Young leaflets i cm. 



B 



j» >» 



Young leaflets 3.5 — 8 cm. 



I 0^ 



Ammonium 

 sulphate. 



A 



)» j» 



No young leaflets. 



B 



» >. 



Leaflets 1-4 cm. 





A 





Young leaflets 1-2 cm., tips of 

 the leaves dried up. 



B 





Young leaflets 2-10 cm,, lip 

 of the leaves dried up. 



'V 



A 





Leaflets appeared. 



B 



If if 



Young k-aflcts 14 cm. long. 



Tliird Experiment. 



Young wheat and barley plants (A) 20 — 22 cm. high were 

 this time (April 8th) subjected to a longer period of starvation 

 than before, namely 7 days, kept in darkness at 10° — 20°C., while 

 the control plants (B) were kept in \% cane sugar solution as 

 before and in daylight, before the solutions were applied. 



Then all the plants were placed in 0.2% and o.\% solution 

 of ammoniun carbonate and for control in water and in 0.2% 

 sodium carbonate. After 3 days it became evident that the 

 plants (A) kept in ammonium carbonate were suffering very 

 much, seven leaves having withered, while the plants (A) kept 

 in water had merely some etiolated but still living leaves, and 



