TINKER—SPRING MIGRATION IN MICHIGAN. 29 
The first positive evidence of the spring migration was re- 
corded on March 2 and 3, when there was a decided rise in 
the temperature, resulting in the disappearance of nearly all 
of the snow, and by the sixth of the month the open ground 
was free from snow. From the first to the sixth the prevail- 
ing winds were southerly, and during this period the Belted 
Kingfisher, Red-winged Blackbird, Marsh Hawk, Robin, Blue- 
bird, Killdeer, Meadowlark, Mourning Dove, Cedar Wax- 
wing, Canada Goose, Bronzed Grackle, American Golden-eye, 
and Canvyas-back Ducks made their appearance. This con- 
stituted the first bird-wave of the season. 
On March 7 there was a return of low temperature and 
northerly winds, with frequent snow flurries, practically put- 
ting a stop to all northward movements of the birds. March 
10 witnessed a return of mild weather, which continued, with 
some slight changes, throughout the balance of the month. 
During this period from March 7 to 30 there was a gradual 
movement of the birds to the north, with heavier waves of 
migration on March 19, 19, 25, 27 and 28. None of these, 
however, brought in as many new arrivals as the first wave of 
the season. The total number of new arrivals noted during 
March was thirty-seven. The entire month was warm and 
remarkably free from the sudden changes which usually make 
the month so disagreeable in this latitude. On the 30th there 
was a cold wave, with heavy frosts on the evening of the 31st. 
April opened fair and warm, with south-west winds, but on 
the 7th there was a return of cold weather, with heavy frosts. 
However, on the 8th there was a warm wave, which continued, 
with some slight variations, up to the 16th of the month, 
when low temperatures prevailed again. This cold wave re- 
mained in force until the 29th, after which it was warm for 
the balance of the month. There was a steady migration 
throughout the entire month, but no decided waves were re- 
corded ‘until April 12, and then not again until the 16th. The 
heaviest migration wave during the entire month took place 
on the 30th. when eight new species were recorded and the 
