2xcerpt from General Notes, Te Ank, Vol. XLVIII, 1o. 3, July, 1931, 
     p. 426. 
 
 
 
          "B3y taking the mber of individvals of a species and dividing

by the nuber of field trips a quotient is obtained which can be 
In oparing the years 1925-1927 with the years 1929-1930 to determine 
the relative decline or increase in the various species. In general 
the decrease has been in direct proportion to the size of the bird* The 
most i=ortant conclusion, however, is that while most of the Buteos 
.and larger species have shown a decrease, the more harmful of the 
Accipiters and Falcons have shown a gain in contrast. Our present 
method of e du~cating (?) hunters and gmkeers has resulted in dimin- 
Ishing the species that should be protected and in Increasing relatively

the more harmful ones which perhaps should be controlled. For the sake 
of simplicity I have shown certain of the comparative species together. 
Considering these as a ihole the frequency (uber of species per field 
trip) has fallen 25% and the umber of Individuals 33%. 
 
          Marsh and Rough-legged Hawks decrease 5)4%. 
          JBiteos - Red-tail, Red-shoulder and Broad-wing decrease 34%. 
          Sparrow-hawk decrease 25. 
          Cooper's, Sharp-shin, Pigeon and Duck Hawks gain 141%. 
 
 
 
                                -Warren F. Maton, 63 NorlAveaue, 
                                              Upper Montclair, N. J. 
 
 
 Filet Hawks and Owle 
       New Jersey / 
       Predator Control 
       Errington