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Received May 2S, 1766. 
XXIV. An Account of fome peculiar Advan- 
tages in the StruElure of the Afperce Arte- 
rice , or Wind Pipes , of fever al Birds ^ and 
in the Land-Tor toife. 
Read June ^"ir RAVING, in my former difcourfe, 
1 ' ‘ JlX given an account of fome particular 
phenomena, in amphibious animals, which rendered 
them more happy and perfect in their animal ceco- 
nomy towards their prefervation ; I fhall now lav 
before this learned Society, certain advantages in fome 
birds, towards aflifting them in the acquifition of their 
food, which they feek for in the water; and fome 
of thefe fwim upon the water and dive down 
occasionally; others only wade into the water, 
in fhallow places, as far as their long legs will carry 
them, without touching the water with their feathers, 
in fearch of their nourifhment. 
The natural hiffcory of four of them is very well 
let forth by authors; the other two are not mentioned, 
that I know of, but barely by their names; and, 
although the author has not defcribed them, yet he 
knew the ftrudtures of their afperae arteriae, and was 
a perfon who made many obfervations in natural 
hiftory, of whom 1 fhall fpeak in his turn. 
Thefe birds are; the wild l'wan, colum, feras, crane, 
Indian cock, demoifelle. 
4 
The 
