SILVER-FOX FARMING. 
25 
HOUSE WITH NEST BOX USED EITHER AS A SHELTER OR A DEN. 
A shelter for the male fox is used rather commonly, • especially 
where two dens are used in a single pen. A type for the purpose. 
Fig. 24. — Double-compartment den with separate chutes. 
which is popular with ranchers using underground dens, is illus- 
trated in Figure 30. During the breeding season a nest box is put 
Fig. 
. — Popular type of double-compartment den with single chute. 
into it for the vixen to whelp her young. The construction described 
for other pens applies to this, with the exception of the dimensions. 
31825°— 23 4 
