272 



M. TSUKAMOTO. 



It would seem from the precediug experiments with 0.1^/^, amvlic 

 îukI allvhc alcohols that the toxicity of amvlic alcohol upon the 

 tadpole is strontifei" tliaii that of allyJic alcoVi«)], coiiti'nry tcj what 

 has heen found in expefiîîseuts ti])i)ii other forms of life which will 

 be described later on, 1 mide. therefore, further experiments with the 

 two alcohols, of the same dilution (U.!*'/,,)? <>^ well ;is of higher dilu- 

 tions. In 0.1 "/„ solutic^ns tadpoles a^-ain died sooner in amyJic than 

 in allylic alcohol. When the animals however appeared to be in- 

 sensible they were tliis time removed into fresh water ; whereupon 

 those that had lieen in the amylic alcohol recovered, while those from 

 the allvlic alcohol did not ; the latter also had convnlsions, but not 

 the former. Tn ().()5"/„ iinivlic alcohol solution most of the tadpoles 

 were ]»aralysed in 1 '/-j hours, hut after 18 hours they recovered, and 

 were alive aftei- .5 days. In 0.01 "/^ solution of thnt alcohol hardly 

 anv action could be noticed. In other experiments, the nnimals were 

 killed in — 



0.05 "/o allylic alcohol after 2 hours 



53 M "^"^ h " 



These observations show that allylic alcohol is a cerii strung poison, 

 far stron^rer than amvlic alcohol. 



Action upon Lower Aquatic Animals. 



Experiments were carried out upon Ostracodes (Cfums and Cypri- 

 dina) iind Infusoria (principally Paramœciuni) in the same manner as 

 those described above. Allylic alcohol was applied in solutions of 



