254 Dr John Davy on the Eggs of Birds. 
albumen. I shall give the results, merely premising that 
in each instance the yolk was separated as much as possible 
from the white, by rolling it, when that could be done, on 
a fine linen cloth, stretched; weighing it thus apart, 
weighing the shell next, after washing it carefully inside 
and drying it in the air. The weight of the albumen was 
inferred to be that which was required to complete the 
weight of the entire egg, previously ascertained. For the 
sake of comparison, the proportions in the egg of the com- 
mon fowl, thus examined, may be given :— 
1. Egg, newly laid, of a pullet of the Barn-door fowl. 
—Weight 764°5 grs. 
Solid matter, 
per cent. 
Shell and membranes, 78°5 grs., or per cent., 10°13 
Toes oe ere 1p 25:21 65:00 
Plbamen.* Teo. SAS ” 64-51 10°19 
2. Jay's egg.— Weight 127°3 gers. 
lie PE co a a 6-4 grs., or per cent., 5°03 
UE, ta ee, ig, oA EE a why a 26°86 30°4 
POON, fu. ss Sey os 68:11 Stee 
The liquid albumen, in a thin glass tube, immersed in 
water at 169° Fahr., falling to 140°, acquired a slight 
milky appearance, with little diminution of its fluidity. 
At 184° falling to 140°, a soft coagulation formed, milk- 
white and tremulous, hardly bearing inversion, At 195° 
falling to 80°, the coagulum became somewhat firmer, but 
much less than the albumen of the common fowl at the 
same temperature, and it was translucent. 
3. Hedge-Sparrow’s.—W eight, 34°5 grs. 
Solid matter 
per cent. 
Shell, &c., 2°0 grs., or per cent., 5°79 
pt | a ee: See =A 21°45 58°1 
Albumen, 25:9 _,, by 72°46 12°2 
The albumen at 168° falling to 110°, became pretty firmly 
coagulated ; the coagulum was of a distinct greenish hue ; 
transparency but little impaired, nor was it lessened at 212°. 
4. Golden-crested Wren’s.—Of five from the same nest, 
