28 The Wilson Bulletin — No. 62. 



life was abundant during this period. A daily average of 17 

 species was observed. Then followed the cold spell of April, 

 continuing till the 20th, with an average temperature of 37°. 

 During this period there was practically no migration, and 

 what became of bird-life, previously so abundant, is an in- 

 teresting subject for speculation. During this period an 

 average of 11 species of birds per day was observed. On the 

 21st the temperature rose to 45°, continuing near that figure for 

 the remainder of the month. Again bird life became abund- 

 ant, an average of 18 species per day being observed. As 

 previously stated May was a cold month and only seven new 

 migrants arrived till the 8th, when ten firsts were observed. 

 This period was one of typical April weather with a temper- 

 ature of 47°, several frosts and a thunderstorm. The birds 

 coming at this time made their way against light north and 

 northeast breezes which blew most of the time. 



On May 12th occurred the great movement of the migra- 

 tion. On this date 21 "firsts" were observed. The wind blew 

 from the south and attained its highest velocity for the month 

 — 40 miles per hour. Its average velocity was 27 miles. The 

 weather was clear with a temperature of 58°. The move- 

 ment continued with little abatement during the 13th, the 

 temperature rising to 71° — the warmest day of the month' — 

 and the wind continued at 27 miles, shifting to the southwest. 

 On this date 14 "firsts" came. The warm spell inaugurated 

 on the 12th continued till the 19th, excepting the 15th, which 

 was cold, with an average temperature of 60°, and bird life 

 was extremely abundant, especially warblers. On the 20th 

 occurred a drop in temperature to 44°, and unseasonably 

 cold weather continued the rest of the month. The effect of 

 this change was very noticeable. The migrants showed very 

 little disposition to progress, but seemed to have broken 

 ranks and were feeding leisurely in the tree-tops. The ex- 

 treme backwardness of the season was shown in the retarda- 

 tion of the foliage which in turn limited the abundance of 

 insect life. During several cold spells, notably on the 15th, 

 the struggle for life seemed extremely severe. The warblers 



