356 



APPENDIX 



youth and agricultural disturbance of the habitat. Beall recommends a square 

 net, a 250-cm stroke, and the studj' and statistical treatment of each sample 



STATIONARY LINE 

 OF 99 TRAPS 



^ ^ 





3 Feet 



MOVING QUADRAT 

 OF 99 TRAPS 



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Group of Three Traps, as Indicated at Left 

 O Past or Future Locations 



Fig. 85. — Showing the Townsend (1935) method of trapping of mice to secure 

 all the regular population. 



separately. This is justified by the variation in strokes, loss of individual 

 animals, etc. (cf . Graham, 1929, a) . 



