484 MISS O. C. LODGE ON THE 



species also ; in fact, subseqiieut experiments showed that tastes 

 varied in different species of blow-flies, e. g., honey and sugar 

 were very attractive to grankmdica, but not at all to Lueilia and 

 CaUiphora, although some of the sxibstances gave similar results 

 Avith the diflerent species. The essential oils tested were found 

 to be repellent to grcenlancUca, and in those cases whei-e tests 

 were made with Lueilia, CaUiphora, and Jlicsca, they were seen 

 to be repellent to them also. They may, therefore, be found useful 

 as ingi^dients in sprays or unguents. 



Experiments were also made to test the effect of certain 

 organic compounds, etc., on house-flies *. 



The following methods of testing them were employed : — 



(1) In which pieces of blotting-paper were soaked in them and 



exposed in sunny places in the greenhouse. 



Suisfances tested. Sestclts. 



Ammonium butyrate Disliked hy the house-flies. 



„ beuzoate „ 



Amyl acetate „ 



MethylluJol , 



Trimeth. chlorh ydi-ate ., 



Vanilla ., 



a-Xaphthaline „ 



f3-Xaphthol ,. 



Ethyl sulphocyawide 



Beet-sugar molasses ., 



Urethaue „ 



Guanine HCl „ 



Guanadine HCl ( + XaOH) 



Trimeth. chlorhydrate (+XaOH) ., 



Leucine A few flies settled on this. 



Artificial musk Disliked hy house-flies. 



(2) In which the substances were added to mixtures of casein, 



sugar, and water, and exposed for two days on the bench 

 in the " fly -room " at the Imperial College (December). 



All were harmless to the flies, nor were any as attractive as 

 the controls. 



A summary of results is given below ; — 



Substances tested. JResiilts. 



12'o c.c. Casein + ^ ' ^ 



12"5 c.c. Bi-own Sugar + f \ ' Verv attractive throughout 



12'5 c.c. "Water C " ') whole experiment. 



(Control) J C 



12 drops Safrol + A Unattractive. 



12 drops Santal -I- A ,, ; flies repelled at first. 



* The account of these experiments testing certain organic compounds on house- 

 flies is placed here, so as to be available for comparison with the similar experiments 

 ou blow-flies. 



