5i8 



Willi am Morton Barroius 



TABLE I 



Numbers of pes out of one hundred, which, in each of eight experiments, entered the several traps charged 

 with odorous substances. The duration of each experiment was twenty-four hours 



No. of Experiment 



Substance in the trap 



No. of flies in 

 trap 



1 Acetic acid 4 per cent 



2 Alcohol 10 per cent 



3 Water (control) 



4 Acetic acid 4 per cent with trace of acetic ether 



5 Glucose and water 



1 Acetic acid 4 per cent 



2 Alcohol 10 per cent 



3 Water (control) 



4 Acetic acid 4 per cent with trace of acetic ether 



5 Glucose and water 



1 Alcohol 10 per cent containing acetic ether .04 per cent .... 



2 Alcohol 10 per cent 



3 Water (control) 



4 Acetic acid 4 per cent 



5 Acetic acid 4 per cent containing acetic ether .04 per cent . . 



1 Alcohol I o per cent with trace of butyric acid 



2 Alcohol 10 per cent containing 2 per cent hydrochloric acid 



3 Alcohol 10 per cent (control) 



4 Alcohol 10 per cent with trace of valerianic acid 



5 Alcohol 10 per cent with trace of isoamyl acetate 



1 Water with trace of valerianic acid 



2 Butyric acid 2 per cent 



3 Water (control) 



4 Propyl alcohol 2 per cent 



5 Water with a trace of amyl valerianate 



1 Water with a trace of acetic ether 



2 Lactic acid 2 per cent 



3 Water (control) 



4 Amyl alcohol 2 per cent 



1 Alcohol 10 per cent with a trace of acetacetic ester 



2 Alcohol 10 per cent with a trace of isobutyl acetate 



3 Alcohol 10 per cent (control) 



4 Alcohol 10 per cent with a trace of methyl acetate 



5 Alcohol 10 per cent with a trace of isoamyl acetate 



1 Alcohol 10 per cent containing .05 per cent osmic acid 



2 Alcohol 10 per cent containing 2 per cent hydrochloric acid 



3 Alcohol 10 per cent (control) 



4 Alcohol 10 per cent containing 2 per cent nitric acid 



5 Alcohol 10 per cent containing 2 per cent acetic acid 



6 



o 



61 



19 



43 



o 



26 



14 



9 



5 

 29 



