272 S. TAKAP.AVASIII ; OX THE POISONOUS ACTION OF 



showed only tlie first stages of withering, which proves again 

 that it was not the degree of starvation itself which brought on 

 the damage in the former case, but a decidedly poisonous action 

 of the ammonium carbonate. Further, the plants (B) kept 

 previously in sugar showed only one completely dried-up leaf 

 and three partially dried up under the influence of ammonium 

 carbonate ; further the chlorophyll with the barley plants was 

 better preserved than with the wheat plants. Finally, the con- 

 trol plants kept in sodium carbonate in darkness showed a much 

 better appearance than those in ammonium carbonate. 



TABLE III. 

 Barley. 





Conditions. 



Length.,,) 



Leaves. 



Remarks. 



April 

 14th. 



April 

 igtli. 



Aiunionium 

 carbonate. 



A 



32 cm. 



33.5 cm. 



All yellow ; two leaves 

 dried up. 



No rootlets ; roots trans- 

 lucent. 



B 



32 cm. 



35 cm. 



All green, but the tips 

 of 3 leaves turned 

 yellow. 



No new rootlets ; roots 

 damaged. 



0.2% 

 Sodium 

 carbonate. 



A 



30 cm. 



32 cm. 



Rather yellow ; two 

 dried leaves. 



No new rootlets. 



B 



30 cm. 



33 cm. 



Two leaves partially 

 yellow. 



New rootlets. 



Ammonium 

 carbonate. 



A 



31 cm. 



33-8 „ 



Green 2 

 Partially yellow 4 

 Dried up 3 



No new rootlets. 



B 



30 „ 



36 „ 



Almost all the leaves 

 green. 



New rootlets develop- 

 ing. 



Water. 



A 



30 „ 



354 



Green 4 

 Partially yellow 3 

 Dried up i 



New rootlets. 



B 



29 



28 „ 



The leaves green, only 

 two of them partially 

 yellow. 



Numerous new rootlets. 



(I) The length of the hngrsl leaves was measured at the beginning (14 April) and at 

 the close of the experiment (19 April). 



