24 8 GOATSUCKER. Clafs II. 



firft joint : the claw of the middle toe is broad, thin* 

 and ferrated. 



Of the difappearance of /wallows. 



There are three opinions among naturalifts con- 

 cerning the manner the fwallow tribes difpofe of them- 

 felves after their difappearance from the countries in 

 which they make their fummer refidence, Herodotus 

 mentions one fpecies that refides in Egypt the whole 

 year : Pro/per Alpinus * alTerts the fame ; and Mr. 

 Loten, late governor of Ceylon, allured us, that thofe 

 of Java never remove. Thefe excepted, every other 

 known kind obferve a periodical migration, or re- 

 treat. The fwallows of the cold Norway f, and of 

 North America J, of the diftant Kamtfchatka §, of the 

 temperate parts of Europe, of Aleppo ||, and of the 

 hot Jamaica **, all agree in this one point. 



In cold countries, a defect of infect food on the ap- 

 proach of winter, is a fufficient reafon for thefe birds 

 to quit them : but fince the fame caufe probably does- 

 notiubfift in the warm climates, recourfe mould be 

 had to fome other reafcnvfor their vanifhing. 



Of the three opinions, the firft has the utmoft ap- 

 pearance of probability -, which is, that they remove 

 nearer the fun, where they can find a continuance of 

 their natural diet, and a temperature of air fuiting 



* Hirundines duplicis generis ibi obfervantur; patriae fcilicet 

 qua? nunquam ab^£y/>/0difcedentes, ibi perpecuo morancur, atque 

 peregrin?-, hs lunt noitratibus ornnino fimiles j patriae vero toco 

 etiam ventre n'gricanr. Hift. JEgypt. i. 198. 



■f Pontcp. lift. iVmw. ii. 98. 



\ Cat. Card. i. 51. app. 8. 



^ Hift. Kamtf. 162. 



\ Rujfcl Alep. 70. 



** Phil, tranf. No. 36. 



their 



