28 Livingston : Chemical stimulation of a green alga 



Table of ceri vin 



KI'.si I I 5 I IBTAINED I'.V Si EVENS 

 CONCENTRATION 



LOWEST INHIBITING 



Clark * worked in a field similar to that of Stevens, making 

 valuable determinations of the effect of poisons upon fungus growth 

 as well as upon the germination of spores. Below are presented 

 those of his results which are of most interest in the present con- 

 nection. The figures denote the lowest fatal strength for the 

 organisms indicated. I have added the decimal equivalent as 

 above, placing it to the right of the sign =, and have arranged 

 the salts in the order of their toxicity. 



Table of certain results obtained by Clark 



* Clark, J. F. On the toxic effect of deleterious agents on the germination and 

 development of certain filamentous fungi. Bot. Gaz. 28 : 289-327, 378-404. 1899. 

 — Electrolytic dissociation and toxic effect. Jour. Phys. Chem. 3 : 263-316. 1899. 



