HOUSE-FLY INVESTIGATIONS, 



483 



C. Sitbstances deterrent, though in a less degree than those 

 given in B. 



Pyridine. 



p-Cresol. 



Naphthaline. 



Phenetole. 



Hydrogen sulphide water. 



Qiiinol. 



Butyric acid. 



Car vo lie. 



Quinoline. 



Anetliole. 



Ammonia (weak). 



Urine (fresh). 



Borneol (in ale). 



Carbon bi-sulphide. 



Aniline. 



Guiacol. 



Toluene. 



Urethane. 



Dimethylaniline. 



Vanillan. 



Ethyl acetate. 



Allyl sulphocyanate. 



Ethyl nitrite. 



Amyl nitrite. 



Lactic acid. 



Cedar-wood oil. 



D. Substances luhich gave no definite residts 



Methyl Indol. 



Indol. 



Pyrogallol. 



Paraformaldehyde. 



Ammonium butyrate. 



„ benzoate. 



„ valerate. 



«-Naphthaline. 

 Skatol (strong). 



„ (dry). _ 

 Trimethylamine (weak). 

 Urea. 

 Tyrosine. 

 Guanine HCl. 

 Betaine. 

 Dimethylamine. 



Methyl alcohol. 

 (t3-Naphthol. 

 Quinine sulphate. ' 

 3 Mono-methyl-uric acid. 

 Triineth. Hci. 

 Acetal. 



Uric acid (dry) + artificial musk. 

 Ethereal extract of horse-manure. 

 NaOH 



Alcoholic „ „ „ 



HCl 

 Precipitate by HCl from NaOH 



extract of horse-manure. 

 Precipitate byNH40Hfrom HCl 



extract of horse-manure. 



E, Substances which gave the same residts as the controls. 



Valeric acid. Terpin OH (ale). 



Aspartic acid. Potass, salicylate. 



Formaldehyde. Salicylic acid. 



Tannic acid. Ethyl formate. 



Leucine. Phenylacetic acid. 



Stearic acid. Caffeine. 



Oleic acid. Acetone. 

 Theobromine. 



Notliing of much practical value was obtained from these 

 experiments. They gave, however, indications of the likes and 

 dislikes of the flies {P. groenlandica), and so appeared useful in 

 differentiating between the tastes of blow-flies ; certain sub- 

 stances (A) were attractive, while othei'S (B and C) were repellent 

 or distasteful in varying degrees ; others, again, gave no definite 

 results (D) or the same results as the controls (E). Since these 

 experiments were made with one species only, i.e., P. grcen- 

 landica, it does not follow that the results will be ti'ue for other 



34* 



