£8 THE NATURAL HISTORY 
The fourth day the feveral humours of the eye 
may be difcovered, the wings grow, the thighs - 
begin to appear, and the body to be covered with 
flefh. 
The fixth day the liver becomes black, and the 
body gets a fkin. 
‘The 7th day the beak is feen, and the begin- 
ning of feathers. 
The lungs appear the ninth day, and the tenth 
day the heart is quite formed. 
From that time until the Chicken be hatched, 
every part becomes daily more perfect. 
If the Hen fhould leave the neft for nearly a day 
towards the latter end of the time of her fitting; 
(and the weather fhould then be warm,) this does 
not always occafion the Chickens to die, but will 
prevent their being hatched fo foon by feveral days 
as otherwife they might have been. 
In Egypt, eggs are hatched in ovens ; the art 
confifts in giving them the proper degree of heat, 
(which is a few degrees more than that of the 
human body) to keep out moifture, and to turn 
them often: but thefe Chickens are frequently 
imperfect, and after they are hatched require 
great care. 
Mr. Reaumur, a very ingenious Frenchman, 
invented for that purpofe artificial Hens, w shich 
are 
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