498 



MISS O. C. LODGE ON THE 



Baits. 



(A.) (a) Various casein, 

 sugar, and banana 

 mixtures placed in 

 saucers in the green- 

 house. 



(b) Meat 



(c) Custard 



Puddina-. 



(B.) Baits consisting of 

 casein, sugar, and 

 water were fed to 

 house-flies enclosed 

 in muslin cages in 

 greenhouse. 



(C.) Balloon trap set 

 over casein, sugar, and 

 water mixtures in 

 greenhouse. 



(D.) Various casein, 

 sugar, and water baits 

 placed in jars with 

 funnels in greenhouse. 



Results. 



With 



Paraforni aldehyde 



added. 



Made no difference 

 to the attractive- 

 ness of bait to 

 house-flies or 

 blow-flies. 



Harmless to both. 



With_ 



Formalin 



added. 



Used strong. Repellent 

 to house - flies and 

 blow-flies. 



Used tveah. Repellent 

 to blow - flies, but 

 house - flies seemed 

 not to detect it until 

 sufficient had been 

 absorbed to kill 

 them, or render them 

 helpless. In no case 

 were all of these 

 latter found to be 

 really dead, a certain 

 number recovering 

 after a time. In 

 one case, out of the 

 600 picked up as 

 dead, 21 o/o had 

 recovered the next 

 morning. The pro- 

 portion of recoveries 

 was often larger than 

 this. 



Repellent to blow-flies. 



P. added while pudding 

 hot. Verjr attractive 

 to house-flies : very 

 many fed, and soon 

 died in and around 

 the saucer. 



Controls. 



Attractive to house- 

 flies, many of 

 which fed — as 

 well as some 

 blow-flies. 



Attractive to blow- 

 flies : very many 

 came and fed. 



Verj' attractive to 

 house-flies. 



(1) Plies still alive after three days, and then released. 



(2) Another lot 

 kept for five days 

 and then re- 

 leased as flies 

 still alive. 



Many house-flies came to feed, which were 

 afterwards caught in balloon traps, where 

 they were kept for two dajs and then 

 released as flies still alive. 



Sometimes un- 

 attractive for 

 many days : 

 other times 

 attractive on 

 first day. Occa- 

 sionally one or 

 two flies died. 



Generallj' attractive for 

 one to three days. 

 Many flies died. 



Attractive : many 

 flies caught. 

 None died. 



