WILD LIFE PROTECTION — WALKER 



343 



An oxample of statistics so arraiified tliat they lan be ;;eiu'rally 

 visualized and advantapeously used is <j:iven in Fi^^ures 10, 11, and 12. 



An intimate knowledge of the conditions explains certain peculi- 

 arities in tile ti^uires, such as periodic ahundaiu-e of the animals, 

 unusual weather conilitions durin;; the dapping season, extensive 



l«l» l«n m« 1» 1« 1«1* lalT i<li« lyiy if»n ifai .foi y^,j 1«» 1«S 19^6 ^9^y 



1 



1 



I 



1 



I 



I 



IVUAOI VALUl 



torn TAiur 

 FiGUUB 11. — Number, avi-nige value, und total valuo of mnrten skins produced in 

 Alaska from 1'.)1L' to 19i;7, Inclusive 



sickness among the trappers, ojjen and closed seasons, as well as 

 variations due to changes in prices of the furs, and variations in 

 numbers of animals from normal causes. 



The overstocking of areas may be illustrated by the example of 

 the farmer who overgrazes his pasture to such an extent that the 



