HOUSE- FL.Y INVESTIGATIOXS, 489 



III. Experhnents imth various fruit and vegetable baits. 

 (^June-July.) 



These experiments were carried out in the same way and 

 utider the same conditions as those on meaty substances. 

 Shredded meat was sometimes mixed with the ,baits, but even 

 then they were never so attractive to blow-flies as meat alone. 

 None of the substances, even after they had been kept for a con- 

 siderable time, were found to be at all attractive to blow-flies, 

 though in some instances a few flies came to them. These sub- 

 stances are marked with an asterisk (*) in the following list: — 



Hay infusion. 



Boiled cabbage. 



Raw cabbage (cut up and moistened with water). 



Boiled lettuce. 



Raw ,, (cut up and moistened with water). 



Boiled grass. 



Grass + water. 



Boiled potatoes. 



Raw „ (cut up and moistened with water). 



Water in which cabbage, lettuce, and grass had been Ijoiled. 



Dates. 



„ + water. 

 Banana. 



* ,, + maggots. 



* „ + ,, -I- meat. 



* „ +meat. 



„ + vinegar. 

 Squashed strawberries. 

 *Strawberries -1- meat. 



* „ -(- „ + maggots. 

 „ + yeast + „ 



„ -H maggots. 



*Strawberry jam +meat. 



* J, j> + J) + maggots. 

 *Stinkhorn fungus (Phallus). 



Further, certain household substances were used, such as bread 

 and cheese, milk, vinegar, etc., as well as mixtures of casein, 

 bread, and water, both with and without maggots. 



The results are given below : — 



Baits. Hesults. 



Treacle Unattractive. 



„ + water „ 



Brown sugar ■ „ 



„ „ -1-water „ 



„ „ + „ -I- meat „ 



„ „ + „ -I- yeast „ 



0x0 + bread + water ,, 



„ + „ + „ -1- maggots ... „ 



Bread -i- vinegar „ 



„ + „ +jam „ 



„ + „ + „ + maggots . „ 



