be maipulated so as to allew of kiling two or more     ks. Iwsr, no 
mipulation of factors ca make it safe to exceed, or eve     approah   the

breei   potential, whioh for 20 doer is about 5 bks. (We d not yet 
know enough about deer to   temino   this thertical potential with cork,.

Zalvromental cotrol, in Its     encm, an as applied to 
hunting grounds, to in effc t the shifting of mortality from naturl e   
smies 
to huma hunters, 
It is not a now Iea. In various empirical fors it has been 
practiced in Zurops sinoe tho Middle Aes, and in Asia since the days of 
Ghengis Khan. The biological equation resnonsible for it.    cce  ws 
probably not nderstod, but this did not wory the Great Kh as long 
his hunting was good. 
Tt should, howver, wor us. Taviromotal control, like 
every other really potent I4ea, is a two-eded sword. It is the only 
possible way of keeping alive the rport of hunting in the fae  of war- 
late& huan poalation growth. This is one e "_ of the sword. The
other 
Is that over-ontrol is open to many abuses. The bittrmess which 3uopoaa 
nato"_lovers feel teward the excessive an   ladisriminnte predator-entrol

practices on private hunting prse    s is a cae  in point, and should be
a 
lesson to namnge.-. of both private and plic hunting gmads in this contry.

oreover, excessive maipulation of envirm     t tends to atificialize sport,

and thus destroy the very social vales which the eonservation movement seeks

to retain. 
and large, these abuses, as far as merica is concerned, 
aro in and of the future. ror the posent,     ntrols are not practiced at