Livingston : Chemical stimulation of a green alga "29 



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, 



as follows : (a) Richards ; (6) Ono ; (c) Livingston ; (d) Clark ; and 



(V) Stevens. 



Stimulation. 



