HOUSE-FLY IXVESTIGATIOXS. 485 



12 drops Hellibore+A Xot verjattracti\e,aon-poisouous. 



12 drops Pyrethnim Extract (Ale.) + A „ „ „ 



r Unattractive, until Xylol had 

 12 drops Xylol + A < evaporated, when flies came 



(. to feed. 



6dropsOilofGeraniol + A (Unattractive at first, later 



(.a tew flies came. 



C Repellent at first. Second day 

 6 drops Oil of Thyme + A •< when smell of thvme less, 



(. a few flies came. 



Bread soaked in water Verj- attractive while moist. 



25 c.c. Ca-sein+ ^ '' 



25 c.c. Brown Suo:ar+ f t> ^ t- ^^ <.• 



o- .1- . '^ ^=1» - \ erv attractive. 



2o e.c. \V ater t , 



(Control) J L 



12 drops Fusel Oil+B Unattractive. 



1 c.c. " Armj Spray "+ B „ , non-poisonous. 



(3) In which certain substances were te,sted against Bacterized 

 Blood*. These experiments were made in the green- 

 house in July. In some (a) a drop of the blood and 

 another of the substance to be tested were placed on a 

 piece of blotting-paper, side bj side yet not touching, 

 while in others (&) the two drops were mixed. 



pViii^ar. 



Propionic acid. 



Absolute alcohol. 



95% „ j r Xylol. 



y V , Amvl „ j ,, ■> ) Methvl salicvlate. 



^"'1 Carvone. j ^'" 1 Butyric acid! 



Pvridine. LAcetic „ 



Oil of Cloves. 



Formic acid. ; 



Acetal. i 



It was noticedr that, generally, the house-flies disliked coming • 

 in contact with the chemicals, although they did not appear to 

 detect them from, a distance. They fed greedily at all places 

 where they could get at the blood without touching the chemi- 

 cals. A few flies, however, came for a short time to formic acid, 

 methyl salicylate, butyric and acetic acids. 



Xylol was distinctly repellent, but after it had evaporated the 

 fiie.s settled on the blood. 



(4) Other experiments were also made with Dried Blood, one 



day old, mixed with water and also with casein and sugar 

 baits, etc. It was found to have no special attraction 

 either for house-flies or blow-flies, appaiently making no 

 diflerenee to an attractive bait, nor rendeiing an un- 

 attractive one attractive. 



* This Bacterized Blood (i. e.. Blood prepared with putrefying Bacteria) was 

 tbund by e.xperiment to he very attractive to house-flies, and also when mixed 

 with casein, sugar, banana, and water. Apparently it had no special attraction for 

 blow-flies (Liwilia and Call ijjJiora), either alone, or mixed with casein baits, with 

 or without shredded meat. 



