74 THE BOTANICAL MAGAZINE. L v i. xxi. no. 243. 



KH a P0 4 0.1 p. mille 0.1 p. mille. 



KNO a 0.5 „ „ 0.2 „ „ 



Ca(N0 3 ) 2 0.2 „ „ 0.5 „ „ 



MgS0 4 0.2 „ „ 0.1 „ „ 



FeS0 4 trace trace 



MgH 2 (C0 8 ) 2 - 0.2 „ • 



When in solution (a) the potassium nitrate was replaced 

 by 0.3 p.m. mono-ammonium phosphate the development was 

 somewhat abnormal, some cells reaching a great length before 

 cell division took place. Also unusually much tannin accumu- 

 lated. 



In the following solution some Spirogyra cells showed a 

 change of the cylindrical shape to a barrel shape, globular 

 formations appeared in the cells, and numerous rhizoids were 

 produced. Death resulted after a few weeks. That solution 

 was : 



Na 2 HP0 4 1 per mille. 



NaHC0 3 0.5 „ „ 



MgS0 4 0.5 „ „ 



Ca(N0 3 ) 2 0.1 „ „ 



KNO3 ! 0.5 „ „ 



FeSo 4 trace. 



It was of weak alkaline nature, and with lime in the 

 minimum. Potassa did not counteract the toxic effects of 

 magnesia, as an increase of lime would have done, in accord- 

 ance with our former observations. 



In the following solution the effect of an excess of lime on 

 the growth of the chloroplast became especially noticeable: 



K 1 H 2 P0 4 0.1 per mille. 



CaSO, 1.0 „ „ 



Ca(N0 8 ) a 1.0 „ 



MgS0 4 0.1 „ „ 



IVSO, trace. 



'I Ik- growth of the cytoplasm and the cell division were 

 here much retarded, the increase of the number of cells was 



