AMMONIUM SALTS UPON PLANTS. 



269 



Continued. 



Sodium 

 sulphate. 



A 



Green 0 ' 

 Partly yellow 3 

 Yellow. 6 \ 



' 9- 



Rootlets damaged. 



B 



Green 0 j 

 Partly yellow 4 

 Yellow. 4 ' 



8. 





0.1% 

 Ammonium 

 chloi'ide. 



A 



Green 0 

 Partly yellow 6 

 Yellow. 6 





No young rootlet formed. 



B 



Green I ' 

 Partly yellow 9 

 Yellow. 3 ] 



13- 



New rootlets appeared. 



0.5% 

 Ammonium 

 chloride. 



A 



Green 0 

 Partly yellow 6 

 Yellow. 6 





No young rootlets developed. 



B 



Green 0 

 Partly yellow 10 

 Yellow. 5 



V 







A 



Green 2 

 Partly yellow 6 

 Yellow. 5 





Some young rootlets developed. 



B 



Green 5 ' 

 Partly yellow 6 

 Yellow. 3 \ 



' 14- 



Numerous young rootlets 

 developed. 



Second Experiment. 



The experiment was repeated on March i6th with barley 

 25 — 30 cm. high and young oniou plants, with the modification 

 that only a 0.1% solution of ammonium carbonate was applied 

 and for comparison sodium carbonate, and further a \% solution 

 of ammonium sulphate and of sodium sulphate. 



After 6 days great differences in the conditions of the plants 

 were noticed. Some etiolation had taken place in all the plants. 

 The ammonium sulphate {\%) had killed the barley plants (A), 

 the sodium sulphate, however, had not done so. The roots and 

 leaves of the plants (A) kept in o.\% ammonium carbonate were 

 much more damaged than those of the plants (B). 



