Zoological Society. 515 
Obs. 1, 
In the Snowy Owl (Surnia nyctea). 
Long Diameter. Short Diameter. 
1:1600 Chass 
1°1500 ? ~ «as 1-4000 1] Common 
rigs) 1:4570f _ sizes. 
172000 | Extreme 1°5333 | Extreme 
1°1333 { sizes. 1°3000 { sizes. 
1°1550 Average. 1-4042 Average. 
The nuclei of the corpuscles, exposed by the action of acetic acid, 
were generally 1-8200th of an inch long, and 1-10666th broad. 
Obs, 2. 
In the Common Brown Owl (Syrnium Aluco). 
Long Diameter. Short Diameter. 
1°2000 1°4000 
1°1895 1°3555 
1°1777 15333 
1°2400 1°3000 
11714 
1°3801 
1°1930 
Obs. 3. 
In the Passenger Pigeon (Columba migratoria). 
Long Diameter. Short Diameter. 
1°2133 1-4800 
1-2000 1-4570 
1°1895 1°5333 
1°1777 1°4000 
1/1714 
1-2666 1°4626 
1°1542 
1-1909 
Obs. 4. 
In the Russet Pigeon (Columba rufina). 
Long Diameter. Short Diameter. 
1°2400 1°3428 
1-2286 1-4000 , 
1-2666 1-3000 
1-2000 
1°3429 
1°2314 
** From the observations on the blood corpuscles of the Snowy Owl, 
it results that their average long diameter is 1-1550th, and their 
average short diameter 1~4042nd of an inch, so that their length is 
2L2 
