. Some common mammals of western Montana in relation to agriculture and spotted fever . Fig. -Two Columbian ground squirrels caught insurface-set jump trap. COMMON MAMMALS OF WESTERN MONTANA. 19 cultivated areas, where each squirrel has but a few holes. Trapsshould be visited at least once a day, in order both to secure the bestresults and to avoid causing imprisoned animals unnecessary suffer-ing. Figure 10 illustrates one way of handling a considerable num-ber of traps. Ordinary Xo. 1 steel traps cost about $125 to $130 a thousand and jump traps are slightly more expensive. FUMIGATION. F
. Some common mammals of western Montana in relation to agriculture and spotted fever . Fig. -Two Columbian ground squirrels caught insurface-set jump trap. COMMON MAMMALS OF WESTERN MONTANA. 19 cultivated areas, where each squirrel has but a few holes. Trapsshould be visited at least once a day, in order both to secure the bestresults and to avoid causing imprisoned animals unnecessary suffer-ing. Figure 10 illustrates one way of handling a considerable num-ber of traps. Ordinary Xo. 1 steel traps cost about $125 to $130 a thousand and jump traps are slightly more expensive. FUMIGATION. Fumigation with carbon bisulphid is very effective when employedearly in the season while the ground is still damp. Dry ground. Fig. —A convenient method of carrying 200 traps and stakes. rapidly absorbs the fumes. Crude carbon bisulphid suitable for thispurpose costs from 8 to 10 cents per pound in 50-pound carboys ordrums. Since it is a volatile liquid and rapidly loses strength onexposure to the air, it should be kept in tightly corked bottles or cans. When bisulphid is used to fumigate squirrel burrows, about atablespoonful should be poured on a piece of loosely rolled cottonor other absorptive material and pushed as far as possible down theburrow, the opening to which should then be immediately hole should be treated, and in case of outlying burrows a littlelarger amount of the bisulphid should be used. As carbon bisulphidis inflammable and the fumes highly explosive, it should never be484 20 COMMON MAMMALS OK \V KSTKli X MONTANA. opened near a lire or where a person is smoking. Figure 11 showsan excellent outfit for using bisulphid. CONCLUSIONS. The Columbian ground squirrel is (he wor
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