Livingston : Chemical stimulation of a green alga 



29 



Salt. 



Oedocephahitn, 



Botrytis. 



Fatal concentration. 



Salt. 



1 



Fatal concentration. 



CoSO^ 



ZnSO^ 



HCl 



HNO3 



H^SO, 

 Ni(N0,)2 



CuSO^ 



Cu(N03), 



Cd(N03), 



AgT^O, 



2)1 T~ 2n 

 «/2 — S/7/10 



n j8^r- 125/7/1,000 

 w/8 125/7/1,000 

 m/i6 625/7/10,000 

 nj\6 625/7/10,000 

 ;7/64 156/7/10,000 

 «/64 — i56«/ 10,000 

 w/i28_ 78?// 10,000 

 «/32,768 — 305/7/10,000,000 



ZnSO^ 



CoSO, 



HCl 



HNO, 



CuSO, 



Cu(NO,), 



H.,SO^ 



Ni(N03)2 

 Cd(NO,), 



AgN03 



/7 ;/ 



77/4 25/7/100 



«/8 125/7/1,000 



;//l6 -:r 625/7/10,000 



^^/32 — 3i3«/ 10,000 

 ^^/32 — 3'3«/io^ooo 

 «/64 156/7/10,000 

 nj 128 ■ 78/7/10,000 

 ;7/4,096 — 245/7/1,000,000 

 n/8, 192 123/7/1,000,000 



The results of these studies of the relative toxicity of the metals 

 toward algae and fungi are presented below in the form of lists, so 

 that they may be more readily compared. The salts studied are 



arranged in order of their stimulating effect — beginning with the 



least effective — under the name of the subject A vertical line at 



the left of several salts denotes their apparent equality in the series. 



Superscript letters attached to the subject names denote authors, 



( 



( 



Stimulation. 



Aspergilhis^. 



1 

 1 



Aspe r^illu^. 



Petiicillium''. 



FeSO^ 



HgCl, 



FeSO^ 



NiSO^ 



■ 



CuSO^ 



CoSO^ 



CoSO^ 



1 



CoSO, 



HgCl., 



ZnSO, 



1 



NiSO^ 



^■—^ ^U 



^K 



1 



ZnSO. 

 LiN03 







