Zoological Society. 



M5 



Obs. 1. 



In the Snowy Owl (Surnia nyctea). 



Long Diameter. Short Diameter. 



1600 



1 



1500 ^ Common 1-40001 Common 



1455 J Slzes ' 1-4570/ sizes. 



2000 \ Extreme 1-5333 1 Extreme 



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 l-3200th of an inch long, and l-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 1-5333 

 1-2400 1-3000 



1-1714 . , 



1-3801 



1-1930 



Obs. 3. 



In the Passenger Pigeon (Columba migratorid) . 



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 1-1 550th, and their 

 average short diameter 1 -4042nd of an inch, so that their length is 



2 l 2 



