142 Western Live-stock Management 
and since the sheep spend most of this time with very 
little feed, it is necessary to work with the greatest pos- 
sible speed. On this account the sheep-men are partial 
to the large plants that can shear an entire band in one 
day. " 
DIPPING 
Dipping for ticks is an operation which should follow 
shearing. Both lambs and mature sheep must be dipped. 
The method of dipping is to run the sheep through a long 
vat or tank which contains a solution of dip. The tank 
on the range usually is long enough so that it takes about 
two minutes for the sheep to swim through. 
The directions sent along with the dip recommend 
dipping twice, nine to ten days apart. The life cycle of 
the tick, however, indicates that it would be better to 
make the time about twenty-one days. The first dipping 
kills all ticks on the animal at that time but has no effect 
on the pup. The second dipping kills the ticks that 
have hatched since the first dipping. There are many 
dips on the market at the present time, all of which fall 
into two general classes, namely, dips which kill by poison- 
ing, and dips which kill by burning. ‘Arsenical dips 
would fall in the first class, while dips such as Kreso No. 
1, Zenoleum, Chloroleum, Lysol, and Creolin and Lime- 
sulfur make up the second class. There is considerable 
controversy between the producers of dips as to the rela- 
tive merits of these two classes. One claims that the 
class which kills by burning damages the wool, while the 
other sets forth the damages resulting from the sheep 
swallowing some of the poisonous dips. Tests have been 
carried on at various experiment stations to determine 
the relative merits of these dips. It appears from these 
