REPORT OF THE SOCIETY 23 



strongly on the oxidases and other enzymes in the tissues, causing serious 

 disturbances. 



It was shown also that fat or fat-Hke membranes absorbed the vapor 

 of gasoline and chloroform, but in doing so became less permeable to oxygen ; 

 that waxen membranes when wet with lime-sulphur also became less per- 

 meable to oxygen. 



Non-volatile finely powdered solids, such as borax, hellebore, sodiu.n 

 fluoride etc., in addition to being stomach poisons, are effective also as con- 

 tact insecticides because they adhere to exudations on the body wall, and 

 later become dissolved and absorbed through the integument into the 

 tissues. 



