126 Jones, Bird Migration in lozva. \ a^'^-a 



mentioned. Besides another short warm period centering on the 

 14th, the month was cold. 



Turning to the charts, no movement of any sort is seen until 

 February, January not appearing on the charts for that reason. 

 In February, 1886, there is a movement of three species north- 

 ward about the 18th, at the close of the first extensive warm 

 period. In 1887 no movement occurred, the month being cold 

 throughout; 1888 shows a very decided movement of four species, 

 about the 2 2d, during a warm period ; 1889 shows two movements 

 during its two warm periods; and 1890 two, the first one caused 

 by the late January thaw, the other by the only other warm 

 period. 



In the same manner March movements may be correlated with 

 March weather. In 1886 there were two decided movements, 

 the first occupying the middle of the month, the other the 25th 

 or thereabouts. The early part of the month was warm, followed 

 on the 17th by a cold period, with a few days, centering on the 

 25th, of warm weather, closing cold. In 1887 the first movement 

 of the year occurred on the first of the month, closely followed 

 by a second movement, ending with a slight third movement. 

 The first and second movements occurred during the same 

 warm period, ending on the 12th; the last movement during 

 the early part of a warm period late in the month. The early 

 part of March was cold in 1888, and no movement occurred 

 until the 15th, during a warm period of six days. Late in the 

 month another warm, period and another movement occurred. 

 March opened warm in i88g, then became cold, and warm 

 again on the 2 2d to the end of the month. At these times 

 movements occurred. In 1890 there is the remarkable phenom- 

 enon of a whole month without any movement whatever after 

 the first seven birds had arrived. But the last half of February 

 and the first half of March were unusually and persistently 

 cold. When the warm period did come, on March 15, the 

 birds flocked in ! 



April is a variable month, without definite weather limits. 

 From March, on the one hand, it receives warm or cold periods 

 as the case may be, and on the other hand it merges into dis- 

 tinctively May weather. The birds properly belonging to it arc 



