N O T E 



The following are the experiments referred to on 

 page 181 : — 



On the 14th May 1915, a nest of Blackbirds approxi- 

 mately four days old was removed at 6.45 a.m. The 

 temperature was considerably below the normal, and snow 

 lay on all the high ground in the neighbourhood. In a 

 short time the birds collapsed, and at 9.15 a.m. were dead. 

 On the 29th May, at 6 a.m., a second nest was removed, 

 containing young of approximately the same age, and 

 although the conditions were more normal, the tempera- 

 ture being 50° F., the birds collapsed at 8 a.m., and an 

 hour later one of the brood showed little signs of life. 

 The wind, however, then changed to the west, and the 

 temperature rose one degree, with the result that they 

 were still living at 11 a.m. A further experiment was 

 made with Song-Thrushes on the 5th June. The wind was 

 in the south and the temperature 63° F. The young, 

 approximately four days old, were removed at 7.25 a.m., 

 but as they showed no signs of collapse at 1 p.m. I replaced 

 the nest in the original site. 



On the 30th May, a nest of Whitethroats three days 

 old was removed at 7.15 a.m. The wind was northerly 

 and the weather fine, but the temperature low — 50° F. 

 At 8.15 A.M. the birds showed no sign of life. A second 

 experiment with this species was made on the 10th June 

 under more favourable circumstances, for although the 

 sky was overcast and the wind northerly, the temperature 

 was 59° F. In this case the young survived from 6.55 a.m. 



to 7 P.M. 



On the 27th May 1915, a nest of Hedge-Sparrows 

 hatched the previous day was removed at 7 a.m. The 

 temperature was below the normal, being 49° F. At 



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