224 



SWAN, POLISH. 



CYGNUS IMMUTABILIS, Yar. 



The Polish Swan, a native of the Baltic, was 

 discovered, described, and named by Yarrell, from 

 specimens shot on the east coast of England. It 

 differs from the Mute or Tame Swan, in having a 

 smaller knob at the base of the upper mandible, 

 and feet of a dull grey instead of black colour ; 

 besides which there is a considerable difference in 

 the internal structure of various parts of the head, 

 Its food and habits closely resemble those of the 

 Tame Swan ; but its cygnets, unlike the young of 

 all other White Swans, are of as snowy a colour 

 as itself. 



SWIFT, COMMON. 

 DAELING, OR SCREAMER. 



CYPSELUS APIJS, Flem. 



The Swift, which is generally dispersed in Great 

 Britain and Ireland, is seldom seen in the northern 

 parts of England before the end of May or the 

 beginning of June, arriving in the south a week 

 or two earlier. It leaves us again for warmer 

 climates in August, a month or six weeks pre- 

 vious to the departure of the Swallows. It resorts 



