SILVER FOX FARMING. 25 
any case to dust the dens with sulphur and insect powder at frequent 
intervals. 
The intestinal .worms infesting foxes are difficult to eradicate. 
Probably more young foxes succumb to the effects of roundworms 
than to any other cause. These worms are whitish, cylindrical crea- 
tures , tapering toward either extremity. Among the symptoms indi- 
cating their presence are dullness, barking, frothing at the mouth, 
dragging the body by the fore legs, and convulsions. The flat, jointed 
tapeworm, often a foot or more in length, is a less fatal as well as a less 
common internal parasite, but animals suffering from them are ema- 
ciated and lack overfur or guard hairs. As a cure for worms one 
breeder of long experience frequently gives his cubs a meal of crushed 
flaxseed and milk, alternating now and then with six or eight drops 
of spirits of turpentine in milk. Another doses his cubs every fort- 
night after they are four weeks old with a proprietary vermifuge put 
up in gelatine capsules for puppies and pet dogs, beginning with half 
of the contents of one capsule. Castor oil containing a few drops of 
turpentine is also recommended. Any remedy administered by 
hand must be pushed down below the base of the tongue, when it 
will be involuntarily swallowed. 
A fox sometimes dies from no assignable cause. More often 
fatalities can be traced to a lack of care or foresight. The dishes 
from which the animals eat and drink should be washed daily and 
scalded frequently. The water should be clean and changed daily. 
The food should be varied and wholesome. Danger from unwhole- 
some food is well illustrated in the experience of one ranchman who 
lost several of his choice breeders through feeding them spoiled fish; 
and another who lost $100,000 worth of cubs as a result of thought- 
lessly exposing meat overnight to the fumes of gasoline in his slaugh- 
terhouse. The appearance of each animal should be critically noted 
every day. On many of the larger ranches a doctor is regularly em- 
ployed to look after the health of the stock. In the care of foxes an 
ounce of prevention is worth a pound of cure. 
IMPROVED STRAINS. 
The fact that domestic animals originated from wild stock and 
that improved strains have from time to time been secured makes it 
reasonable to assume that other wild animals can be differentiated 
and improved by the same method, namely, selective breeding. 
So far as foxes are concerned, this has already been done. The 
pioneer fox breeders began with ordinary silvers, which have a tend- 
ency to produce red as well as silver progeny. At that time dark 
pelts were more valuable than light-colored ones. By regularly dis- 
posing of the less desirable cubs and breeding only from the best, 
the tendency to throw red was soon eliminated, and the color of the 
