216 ANIMAL COMPETITORS 
northward to and including the border of the 
treeless tundra. The red phase inhabits nearly 
all this region, but the silver phase, although 
known in most parts of it, is very irregularly 
distributed. In general it is much more com- 
mon in northern localities than in southern, 
and seems especially numerous in Newfound- 
land and on the interior heights of Labrador. 
Altogether, it appears likely that the area 
suitable for rearing silver foxes successfully is 
confined to Canada, and a small strip of coun- 
try south of it, including the higher parts of 
the Alleghenies. Prince Edward Island has 
already about 100 breeders, and can supply good 
breeding-stock. 
Arrangement of breeding-quarters. It is a 
mistake to suppose that a great space is re- 
quired for rearing silver foxes, or a rough area 
approximating natural conditions of fox-life. 
Indeed, this is disadvantageous, for it tends to 
keep the animals so wild as to be unmanage- 
able. The endeavor should always be to tame 
the captives as much as possible, and to do this 
a small and uniform area is necessary. Foxes 
thrive in enclosures not more than 40 feet 
