12 
in water in the proportion of 20 gallons of oil to 80 gallons of water, 
with the addition of 5 pounds of soap. This apparatus is claimed to 
be able to take care of from 3,000 to 4,000 head of cattle per day. 
With this or some similar device the control of the horn fly ou a 
broader scale may prove practicable. 
Horn-fly traps.—Various attempts have been made to collect horn 
flies from cattle by means of traps, the general plan being to pass the 
CROSS LFACE 
Fic. 6.—Cross section of dipping vat used by Mr. A. P. Borden. (Original.) 
cattle through a dark room or chamber arranged with brushes at 
the exit to drive the flies from the cattle and retain them in the 
chamber, where they may be attracted to a lighted cupola, captured, 
and destroyed. Mr. P. J. Parrott, while connected with the Kansas 
Experiment Station, conducted elaborate experiments in this direc- 
(Cir. 115] 
