﻿98 BOTANICAL GAZETTE [February 



Pb(N03)j, when i in 100,000. From the Pb and Ni results 



Elodea (and Callitriche) would seem very resistant as compared 



with other flowering plants ; and in fact the tabulated results as 5 



a whole justify that view. And yet it ranks with the most 



sensitive when treated with Hg or Ag. 



\To be conchided^ 



I 



i 



^ 



f 



fc 



