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CHAP. III. 



HE learned and ingenious diiFer fo widely 



in their accounts with relation to the 

 places where thefe birds go, it may afford the 

 curious reader no difagreeable entertainment to 

 give him their various fentiments on the fub- 



jea. 



Dr. Derham remarks, " Swifts and Swallows 

 have remarkably fhort legs, efpecially the for- 

 mer, and their toes grafp any thing very flrong- 

 ly : all which is ufeful to them in building their 

 nefts, and other fuch occafions as necelTitate them 

 to hang frequently by their heels. But there is 

 far greater ufe of this ftrudure of their legs and 

 feet, if the reports be true of their hanging by 

 the heels in great clufters (after the manner of 

 Bees) in mines and grottos, and on the rocks by 

 the fea, all the winter. Of which latter, I re- 

 member the learned Dr. Fry told this ftory 



H 2 



