Nov. 1907.] KUSANO.-PHOBO-CHEMOTAXIS OF MYXOMYCETES. 145 



Aethalium Stemonitis Comatricha 



Chromic acid A. ..A.. .A 



Boric acid a... ? ... ? 



Formic acid A. ..A... A 



Hydrocyanic acid a—? . . . a—? . . . " — 



Acetic acid A ... A ... A 



Propionic acid A ... A ... A 



Butylic acid A. ..A.. .A 



Valerianic acid A. ..A. ..A 



Lactic acid A. ..A.. .A 



Oxalic acid A ... A ... A 



Succinic acid A.. .A.. .A 



Malic acid A ... A ... A 



Tartaric acid ...... A ... A ... A 



Citric acid A. ..A. ..A 



Picric acid A... ?... ? 



' Salicylic acid A... ? ... a 



Tannic acid a ...?... ? 



Acidic salts used in my experiment are the following : — acid 

 calcium malate, primary calcium phosphate, monopotassium 

 phosphate, potassium bisulphate and sodium bisulphate. All 

 these salts exert an apparent attraction upon the swarm-spores 

 of all given species. 



Bipotassium chromate, anilin sulphate and anilin chloride 

 give by hydrolysis acidic reaction to their solutions. Their 

 attraction is nearly similar to that of the above cited salts. 



Among the extracts from vegetable bodies the acidic ones, 

 such as those of citrous, apple, grape and Punica fruits, or of 

 the leaves and stems of Rumex, or of some decayed wood 

 which is traversed by a fungus mycelium, are proved to contain 

 an attractive substance. The intensity of their action is of 

 course proportional to the degree of acidity. 



From these experiments we can not but conclude that the 

 positive chemotaxis of the swarm-spores of Myxomycetes has 

 a close connection with the acidity of the substances to he 

 tested. 



