34 PROCEEDINGS OF THE 



lation, as many birds would not be moving. Granted that 

 two-thirds of all these birds were seen and we would have 

 an average of 6. 71 birds to the square mile. About j-^ of the area 

 of the state may be included in the hilly section of the North, 

 where the Turkey Vulture is less numerous than in the remain- 

 der of the state. Again assuming^ and taking 3, per square mile 

 as a fair number for this hilly region we would have the general 

 average for the entire State as 6.40 birds to the square mile. 

 The area of Delaware is somewhat over 2100 square miles so 

 that under such a system of reckoning we have a total of about 

 13.440. It would appear that we might almost ignore the R. 

 R. records, as they are so constantly lower than the others and by 

 so doing and adding ^ would have an average about 8. 5 to square 

 mi., and a total of about 17.850, ^ as a number for the Turkey 

 Vulture population of the state. It is evident that the factor of 

 uncertainty has appeared several times in the forgoing estimate 

 and that the result may be far from exact. However the records 

 are given as taken and those interested may draw their own con- 

 clusions. 



For reference Wilson Bulletin No. 74, March, 1911, p. 41 and other " Bird 

 Horizons." Bunes in Wilson Bulletin No. 37, Dec, 1901, and Osprey, Vol. 

 II, p. 48. Gault in Wilson Bulletin No. 28, Vol. 6, No. 5, p. 65. 



^ With one exception no Records on cars equalled 3 J to the square mi. y 

 while off the cars none was below 4. 



