90 



THE BOTANICAL MAGAZINE. i CVoi. xxxrv. No. 402. 



Ca(N0j 



Mg(N0 3 ) 



Mg50. 



Ca(M,P0J ; 



Ca(H a Pa 



e< v H ; 2 



Ca(N0 



Ca50. 



Mg(h 2 ?0j z CaSO, 



Mg(hj>0j; 



CofNO^ 



igov^ 



Mg(H,P0j 2 M^SO 



Cq(H 2 P0, 



Fig. 1. 



