maggots in the Cattle on the neighbouring farms. As it was an 
instructive contrast was noticed between the liability to warbles of 
the young Cattle and Calves grazed at the centre of the farm, as 
compared with those which spent the summers in outlying fields, 
where they were exposed to the incursion of Flies from the sur- 
rounding farms. 
GENERAL RESULTS OF SYSTEMATIC MAGGOT-DESTRUCTION 
DURING THREE SUCCESSIVE YEARS 1907-1908, 1908-1909, 
1909-I9I0. 




In centre of farm. On outskirts of farm. 
ñ di a: a n arg 
Sla Se Sia Bi SE eher 
LE sa | esa) 35 Sa | 2288 
ES EE ESA EE ENS ESS 
== SM ESF Da 3 IA 
Lita Zi SHS aren Zilles ud 
lo) 2 o o O © 
CA co. 90 811 9 3 55 18.3 
Yearlings and Heifers. 43 229 5032 102 1,275 12.5 
(COS TT, 130 321 2.47 70 241 344 
The above results show that systematic maggot-destruction on 
the farm, as carried on during the last three years, is effectual in 
materially reducing the liability of the Animals — especially 
Yearlings and Heifers — to attack by the Warble-Flies. It is rather 
noteworthy that while, before the destruction, yearling Cattle were 
found to be more liable to attack than Calves, in the subsequent 
years the figures for Calves have been, on the whole, higher than 
for Yearlings. That is to say, the practice of maggot-destruction 
benefits, for some reason, Yearlings and Heifers more than Calves 
exposed to the same risk of attack. Milch Cows seem to be always 
freer from warbles than the younger Cattle. 
As a practical outcome of the experiments, it is evident that 
preventive dressings can no longer be recommended for use with 
any prospect of success. Systematic maggot-destruction can, on 
the other hand, be recommended with confidence, but its results 
