HOUSE-FLY INVESTIGATIONS. 493 



Casein + bread + water 5-12 



„ + brown sugar + water 3-6 



„ +banana + water 1-6 



,, + „ + brown sugar + water 3-8 



„ + golden syrup + brown sugar + water 1-4 



„ + white sugar + water 1-2 



„ + „ ,, + „ +Alc 5-8 



Beer + brown sugar 1-4 



Casein + „ „ +stout 1-2 



„ + „ „ + „' 3-4&7-8 



„ + stout 1-4 & 1-12 



Brown sugar + stout 1-6 



Casein + golden syrup + stout 3-8 



Pudding (made of egg, gelatine, sugar and milk) 1-6 



Horlick's Malted Milk + water* 1-6 



„ „ „ + „ +banana ., 3-4 



Casein + banana -I- Malt Extract -I- water 6-6 



„ + brown sugar + water 5-10 



„ + „ „ + „ +bread 5-10 



„ -I- golden syrup -H bread -I- water 1-2 & 7-8 



Ccrnflo wer + milk -I- sugar * 3-4 



Bird's Custard Powder + white sugar 4- milk * 1-4 



Boiled milk + white sugar -f- starch 1-2 



CJasein + brown sugar -I- water (boiled together) 1-2 



Dutch cheese -I- brown sugar -H water 1-2 



Casein + water (boiled together) 3-6 



(K) Substances attractive, though in a less degree than 

 those given in (J). 



Days oil tvhich most attractive 

 Halts. {when approximately 60-80 



flies caucfht at each count). 



Casein + brown sugar -1- water 3-4 



„ -)- Alcohol + water 11-12 



„ +MaltExtract 3-6 



„ -I- bread -l- banana -I- water 3-4 



„ -H water (boiled together) 1-2 



Toasted cheese 1-2 



Casein -t- brown sugar -i- beer 1-2 



(L) Substances to which Flies still ca7ne, though never more than 

 approximateli/ 30-50 were caught at each count. 



Days on ivhich the 

 Salts. above number' of 



flies were caught. 



Banana -I- maggots 5-6 



Casein -H „ -i- bread -F water 11-12 



Brown sugar -1- Alcohol -I- water '. 1-2 



Casein + water 5-12 



„ -1- brown sugar + beer 1-2 



Horlick's Malted Milk + brown sugar -(- water 3-4 



Bird's Custard Powder + boiled water 5-8 



* Most of the flies died which fed on the three baits marked with an asterisk (*). 



