PHOTOGRAPHING BY FLASHLIGHT. 247 



our observations upon House Sparrows incline us to 

 think that they sleep sounder in summer than in 

 winter ; for during the former season they are easier 

 to approach and examine, with their heads buried in 

 their feathers, than in the latter. 



I think it will be found that the great majority 

 of birds sleep in similar situations to those in which 

 they have been bred; however, there are many 

 notable exceptions to this rule. Pheasants are 

 hatched on the ground, and roost in trees after 

 their autumn moult at any rate ; Fieldfares nest in 

 trees, and often sleep upon the ground, as I have 

 proved again and again by Hushing them from bare 

 fields on dark winter nights. 



We have endeavoured to take photographs of 

 birds on their roosts in summer-time, but found it 

 impossible on account of the thick foliage. The 

 accompanying picture of a red underwing moth in 

 the act of sucking up an entomologist's rum and 

 treacle from the bark of a tree, however, shows 

 the possibilities of the magnesium flashlight. 



RED UNDERWING MOTH. 

 (Photograpked by Magnesium Flashlight.) 



