Spring Migration of 190 1. 97 



birds came one the 17th ; very few, however, if more than 

 one or two. One was reported each of the remaining days 

 of the month. 



On the morning of March 1st the temperature rose to 

 32 , with the wind blowing steadily from the south. It 

 continued warm for four days, when the first definite bird 

 wave appeared. Four species arrived and four departed. 

 The arrivals were Rusty Blackbird, Robin, Killdeer, and 

 Canada Goose. This was the only definite wave of this 

 month. The remainder of the month was characterized by 

 rainy and cloudy weather, there being only four clear days. 

 The wind was exceedingly fickle, often changing as many 

 as three times a day, blowing very frequently in the even- 

 ing and afternoon from the opposite direction from what it 

 did in the morning. However, during this time there were 

 thirteen scattering arrivals and two departures. 



April was but a continuation of the March weather, being 

 damp and chilly. The prevailing winds were northerly and 

 the average morning temperature was 38. 6°. There was no 

 definite wave this month, all the arrivals being scattering. 

 The bird population was greatly increased, Meadowlarks 

 especially being abundant and Mourning Doves and Flick- 

 ers common. During the month there were thirty-nine ar- 

 rivals and twenty-one departures, no more than three or 

 four occurring in one day. 



The month of May, too, was damper and colder than 

 usual. The average morning temperature was 50 . The 

 winds were northerly and steadier than in April. During 

 the month fifty-seven species arrived and thirty-seven de- 

 parted. There were two very definite waves. The first 

 came on the opening day when fifteen species arrived and 

 two departed. This was the warmest day of the year up 

 to this time. The temperature then fell till the 5 th, when 

 it rose to 50 . On the following day, the 6th, was the best 

 defined wave of the season. Twenty species arrived and 

 three departed. 



The season has been characterized by the long continued 



