178 
THE NATURAL HISTORY 
[LETT, 
bred out of buildings ; and that was in tlie sides of a deep chalk- 
pit near the town of Odiham, in this county, where I have seen 
many pairs entering the crevices, and skimming and squeaking 
round the precipices. 
As T have regarded these amusive birds with no small atten- 
tion, if I should advance something new and peculiar with 
THE SWIFT. 
respect to them, and different from all other birds, I might 
perhaps be credited ; especially as my assertion is the result of 
many years' exact observation. The fact that I would advance 
is, that swifts propagate on the wing : and I would wish any 
nice observer, that is startled at this supposition, to use his own 
eyes, and T think he will soon be convinced. In another class 
