DELAWARE VALLEY ORNITHOLOGICAL CLUB. 35 



reliable idea of the progress of migration than can be obtained 

 by comparing any two individual records. 



II. 



In preparing a report on the spring migration of 1902 we 

 have not attempted to publish all the data contained in the in- 

 dividual records, as much of the information can only be util- 

 ized when we have records covering several consecutive years, 

 from which we can make comparisons and draw deductions. 



For the present we have prepared two tables, the first, com- 

 prising observations on all of the ninety birds printed on the 

 lists, as recorded at fourteen stations situated approximately 

 within ten miles of Philadelphia. This gives a summary of 

 observations on migration in what we may call the "Philadel- 

 phia District" for the year 1902. To this has been appended 

 a list of other species or additional notes on those contained in 

 the table, as furnished by observers. 



Table II. consists of observations on thirty-two of the best 

 known and most easily identified species at sixteen stations out- 

 side the ten-mile circle, compared with the observations within 

 that district which have in this table been combined in the way 

 above described into four sections, as follows: 



I. Moorestown, N. J. 



II. Tinicum, Swarlhmore, Lansdowne and Mt. Moriah, Pa. 



III. West Fairmount Park, Ardmore, Haverford and Bryn 

 Mawr, Pa. 



IV. Germantown, Chestnut Hill and Olney, Pa. 

 Haddonfield, N. J., would have formed another section but 



the oliservations from there were not sufficiently complete to 

 warrant their use in this table. 



The location of most of the stations ma}' be seen on the 

 map accompanying Table II. B3' studying the tables a 

 pretty accurate idea of the time of arrival of the various spe- 

 cies may be obtained, especially in the Philadelphia district 

 where so many observers have been in the field. So far 

 as comparisons are concerned, however, results can only be 

 regarded as tentative until verified by the records of several 



