14 Thomson, Detection of Arsenic in Beer. 



From these results I conclude that in using 250/0. of 

 beer, as recommended by the Committee, and completely 

 destroying the organic matter, a very faint mirror is pro- 

 duced with those containing y^oth of a grain per gallon, 

 but when the beer is used direct with amyl alcohol no 

 mirror at all is produced, and therefore this direct method 

 fails to detect an amount considerably greater than that 

 which the Committee regard as sufficient to condemn the 

 sample, 



I take this opportunity of thanking my assistant, 

 Mr. Samuel Bateman, B.Sc. (Vict.), for the great care and 

 intelligence which he has bestowed on the carrying out of 

 these experiments with me. 



