1170 Life-histories of Northern Animals 



piles, that rise in yellow foursquare towers by hundreds on the 

 banks. 



But again a change comes with the equinox. Each year, 

 about September 21, the flittering host of eventide is gone — 

 has disappeared as mysteriously as it came. The workmen no 

 longer discover them crouching during the day beneath the 

 sheltering boards. They have totally vanished, and all the 

 evidence I have goes to show that this disappearance is due to 

 migration. 



How much farther south do they go ? 



Miller says:" "The Silver-haired Bat occurred in spring 

 and fall about the light-house on Mount Desert Rock, 30 

 miles off the coast of Maine, a treeless islet where Bats were 

 at other times unknown." 



He states also that though the species was unknown in 

 early summer at Highland Light, Cape Cod, Mass., "the 

 animals * * * suddenly became numerous shortly after the 

 middle of August, and remained abundant for about a month, 

 when they as suddenly disappeared." 



Thus they are being traced on their route and marked 

 down in their seasonal homes. Before long the fragmentary 

 observations of many naturalists put together will spell the 

 truth and show us that the Bats are as migratory as the birds, 

 and, though long despised, may be also as interesting and 

 beautiful. 



' N. A. Fauna, No. 13, 1897, p. 11. 



