515 



T1550 Average. 1'4042 Average. 



The nuclei of the corpuscles, exposed by the action of acetic acid, 

 were generally 1 -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 migratoria). 



Long Diameter. Short Diameter. 



1-2133 1-4800 



1-2000 1-4570 



1-1895 1-5333 



1-1777 1-4000 



11714 



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 5 50th, and their 

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



2 l 2 



