26 The Ornithology of Chester County 



accomplished good work in the vicinity of Berwyn. 

 In 1901, the writer of this sketch published a sec- 

 tional bird census, taken at Berwyn. This was the 

 first List from the eastern border and embraced only 

 the breeding birds ; it was followed by a similar one 

 in 191 5, showing the slight changes in the number 

 of individuals in the same area over a period of years. 



In consideration of the popular character of the 

 foregoing and for the sake of brevity, I have, where 

 ever possible, used the common English "book" 

 names of the species in preference to the scientific 

 or technical terms usually employed. In many in- 

 stances these names have been in use for a long time 

 in this section; also, not being subject to the laws of 

 priority, they are less liable to change, and all are 

 perfectly intelligible to the average English-speaking 

 ornithologist. Many of the names have the addi- 

 tional merit of perpetuating the vernacular of our 

 Colonial forefathers, to whom the appellation con- 

 veyed some real or fancied characteristic of the 

 species, and they are altogether most expressive both 

 in prose and poetry. 



The ornithological literature of the county is 

 large, I regret that it is not feasible to include a 

 complete bibliography; but reference to the more 

 important contributions appear in the annotated 

 catalogue of species. I am indebted to the follow- 

 ing persons for biographical notes or portraits: W. 

 L. Baily, Gilbert Cope, Ruthven Deane, Watson W. 

 Dewees, Wm. B. Evans, J. Comly Hall, Prof. J. 

 W. Harshberger, Rev. W. H. Hazard, Mrs. Ber- 

 nard A. Hoopes, J. P. Norris, Jr., Chas. W. Palmer, 



