Dr John Davy on the Eggs of Birds. 205 
the weight of each was as follows: 14°8 grs., 14:4, 14:3, 14°35, 
15:2. That which weighed 14:3 grs. was examined. | 
Solid matter 
per cent. 
Shell, &c., 0-7 grs., or per cent., 4°90 
Yolk, . 3°44 ,, Re 24°05 43°6 
Albumen, 10:16 _,, a 71:05 9-9 
One of the eggs was put into water at 200° falling to 140°. 
On removal of the shell its albumen was found coagulated. 
The coagulum was soft, semi-transparent, slightly opalescent, 
and in water had a bluish tinge. The yolk was more firmly 
coagulated. 
5. Robin’s.—T wo were examined ; one weighed 38'8 grs., 
the other 73°8 grs. I believe they were from the same nest. 
Solid matter 
per cent. 
Shell, &c., of the first, 2°1 grs., or per cent., 5°43 
Yolk, . ; : Ged ee F 24-22, 
ikamen, PTR mst 20) Oe se 70°33 
Shell, ah of second, 2:0 ,, “) a7 
ee Oe ES Pye. gO , 22:08) 165 
Aibpamen, 0. |. Ob ,, 9 75°20 8:2 
The albumen of the first at 170° falling to 145°, became 
of a milky whiteness, with little diminution of fluidity. At 
187° falling to 150°, a soft coagulum formed, of the con- 
sistence of blanc-mange, and milk-white, nor was it rendered 
harder by boiling. 
6. Missel-Thrush’s.— Weight of egg, 124°6 grs. 
Shell, &c., 64 grs., or per cent., 513 
ret ie LBRO! 3 be 12°84 
Albumen,101°3 _,, 3 31°30 
The albumen at 169° falling to 148°, had its fluidity 
slightly impaired, acquiring a slight degree of milkiness. 
At 179° falling to 150°, a soft coagulum was formed, tremu- 
lous, with a bluish hue, and barely admitting of inversion. 
At 188° falling to 160°, it became firmer, remaining trans- 
parent, nor was its transparency destroyed by boiling ; even 
then it was softer than the coagulated white of the hen’s egg. 
Its yolk at 190° yielded a soft coagulum, which was 
rendered only a little firmer by boiling. 
