256 OBSERVATIONS ON 



of different species) are not subject to a 

 torpid state in the Winter, as most winged 

 insects are. At night, and in frosty wea- 

 ther, and when it rains and blows, they 

 seem to retire into those trees. They often 

 are out in a fog. WHITE. 



This I have also seen, and have fre- 

 quently observed swarms of little winged 

 insects playing up and down in the air 

 in the middle of the Winter, even when the 

 ground has been covered with snow. 



MARKWICK. 



HUMMING IN THE AIR. 



There is a natural occurrence to be met 

 with upon the highest part of our down in 

 hot Summer days, which always amuses me 

 much, without giving me any satisfaction 

 with respect to the cause of it ; and that is 

 a loud audible humming of bees in the air, 

 though not one insect is to be seen. This 

 sound is to be heard distinctly the whole 



