I have written this book for those who are beginning a study of birds in Pennsylvania; or for those who, after some study in a certain region, wish to know more about the birds in other sections of the Commonwealth. Throughout the manual I have attempted to stress the points which are of importance to the field student, and have tried to eliminate material which might lead to confusion.

Thorough, detailed works on Pennsylvania birds are needed. Such volumes, one on western Pennsylvania, by W. E. Clyde Todd, of the Carnegie Museum, Pittsburgh, and one on eastern Pennsylvania, by Dr. Witmer Stone, of the Philadelphia Academy of Arts and Sciences, are in the making now. But it may be years before these completed volumes are ready for distribution, and in the meantime our budding ornithologists are carrying on their studies handicapped by a lack of any sort of reference work which is up-to-date, understandable, simple and local in its treatment, and within reach of those of average means. This volume has been prepared to meet this need.

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