56 PROCEEDINGS OP THE 



Bristol, Thomas D. Keim and Sidney V. Morris. 



Glenside and Edge Hill, Richard C. Harlow. 



Fort Wasliington, James L. Camblos. 



Woodbourne, Edward Pickering, Jr. 



George School, Students. 



George School, Wm. E. Roberts. 



George School, Jesse Packer. 



George School, Robt. E. Atkinson. 



Easton, Edw. J. F. Marx. 



Perkasie, Albert C. Rutter. 



Columbia, Wm. F. Rochow. 



Marietta, W. H. Duller. 



Lopez, Otto Behr. 



Particular interest attaches to the migration of 1907 on ac- 

 count of the unusual weather that prevailed during April and 

 May, unprecedented within the memory of most of our ob- 

 servers. 



February was noteworthy in showing no evidence of migra- 

 tion. The flight of Purple Grackles, Redwings and Robins 

 which usually marks the latter part of the month, was entirely 

 lacking. 



March, in most respects, was nearly normal. The mean tem- 

 perature for the month at Philadelphia was 44°, four degrees 

 above the mean of the past thirty-seven j'ears, while the rain- 

 fall (including snow) was less than usual. There were three 

 marked increases in temperature during the month, the mean 

 daily temperature increasing fourteen degrees between the 1st 

 and 2d, twenty degrees between the 12th and 14th, twenty-six 

 degrees between the 21st and 23d and thirty degrees between 

 the 26th and 29th. On the last date the maximum was 86°, 

 the highest March temperature registered at Philadelphia diiring 

 the thirty-seven j-ears covered by the Weather Bureau's record. 

 This was followed by a fall of forty degrees, from a mean tem- 

 perature of 74° on March 29th to 34° on April 1st. 



We have then in March four daj-s upon which marked in- 

 creases in temperature reached their ma.ximum, /. e., March 2d, 

 14th, 23rd, 29th. Such days are generally followed by so-called 

 bird-waves, and our records show this to have been the case 



