106 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 10 



Experiments with Carbohydrates in Solution with Acetic 

 Acid and Alcohols 



Mixtures of maltose, lactose, sucrose and dextrin with ethyl alcohol, 

 amylic alcohol and acetic acid were made, using five grams of the car- 

 bohydrate to fifty cubic centimeters of solution. The alcohols and 

 acetic acid were made up in 4 per cent concentrations. The results 

 are stated in the following table: 



EXPERISIENTS ON CARBOHYDRATES WITH AlCOHOLS AND ACETIC AciO 



In every case the attractiveness of the carbohydrates was increased 

 by the addition of amylic alcohol, ethyl alcohol or acetic acid. Amylic 

 alcohol was more effective when used with carbohydrate than when 

 used alone; indeed, with maltose and dextrin it appeared to be re- 

 markably attractive. Ethyl alcohol was more attractive with maltose 

 and dextrin than when used in aqueous solution, but less so when 

 used with lactose and sucrose. Acetic acid seemed to be about as 

 attractive when used alone as when added to solutions of the carbo- 

 hydrates employed in these experiments. 



Experiments with Other Food Substances 



Wheat Flour: — The fact that bread has some value as a fly bait, 

 especially when added to other mixtures, led to a study of the attract- 

 ive constituents of wheat flour. Owing to a lack of time, it was not 

 possible to carry this investigation very far. 



