ANNUAL MIGRATIONS 133 



In August a trapping camp was accordingly estab- 

 lished in suitable territory and every conceivable 

 means of getting crows alive was attempted. We 

 learnt a great deal that was interesting and much 

 that was amusing about the mentality of crows but 

 the middle of September when the last bird had gone 

 south, saw us with only 140 individuals caged at 

 Edmonton whither they had been shipped. Not all 

 of these sur\aved and after the necessary samples 

 had been taken for blood analyses, examination of 

 the gonads, etc., only 83 remained at the time of 

 liberation, 69 experimentals and 14 controls. All 

 of them were in perfect health and first-class 

 condition. 



They received treatment on exactly the same lines 

 as that given the juncos. The lighting, totalling 

 12,500 watts, was based on the ratio (of watt per 

 cubic feet of cage space) that we had found most 

 effective in the case of the juncos. The crows 

 remained fully active while the lights were on. The 

 experiment commenced on September 28, the daily 

 extension of illumination being exactly that of the 

 1927 junco undertaking. On Saturday, November 

 9, the birds were turned out during the morning. 

 The fact that they had been released was broadcast 

 from various radio stations on the Saturday night 

 and the universe in general invited to shoot them 



