20 
still more to 29.56 inches. In the mean time an area of high pressure 
developed at Dodge City, Kans. The effect on the wind was as fol- 
lows: From Saint Louis southward the winds began to shift to SW.; to 
the northwest of that place they became NW. and N.; while to the 
northeast of Saint Louis they shifted to SW. and W. As would be 
expected, those places which had W. and NW. winds had clear skies, 
while the district from Saint Paul and La Crosse to Chicago and east- 
ward was cloudy. The temperature from Saint Paul northwest, north, 
and northeast rose. At Saint Paulit was stationary, and thence south- 
ward it fell a few degrees, but stillremained warm. The, wave of migra- 
tion seems to have exhausted itself in a single night. Some forty 
‘firsts’ were recorded for this day, but, except at two places, they 
seem to have been arrivals of the previous day, which had been over- 
looked. These two stations, Waupaca, Wis., and Heron Lake, Minn. 
(with its neighborhood), furnished one-half of the forty records, and 
both’are on the northern edge of the district covered by the preceding 
night’s migration. It seems, then, that at these places there was a local, 
though, in the case of Heron Lake, a very large migration. 
March 24 was marked by cloudy weather after a clear night. South- 
erly winds prevailed over the Upper Mississippi Valley, varying from 
SE. to SW., and mostly light. The temperature had fallen, on an av- 
erage, 5° from Chicago to Bismarck and northward. It had risen 
strongly 9° to 11° at Yankton and Omaha, this rise probably being the 
cause of the arrival of immense numbers of water-fowl during the day 
at Heron Lake, Minn., all coming from the west, that is, from the 
direction of Yankton, at which place at 7 a. m. aS. wind was blowing. 
It was a day of general low pressure. The whole district, from Cairo 
to Moorhead, was included between 29.80 and 29.89 inches. Northward 
and eastward, in Manitoba and at Marquette, Mich., the barometer fell 
to 29.65; in the southwest, at Fort Smith, Ark., it fell to 29.71; and 
westward, at Deadwood, Dak., it rose to 30. An area of low pressure 
developed at Fort Smith, Ark., in the early evening of March 23, and 
became pronounced during the next twenty-four hours. At 7 a. m. of 
the 24th the effect of this area was hardly felt, but by night the wind 
had been attracted to it over most of the Upper Mississippi Valley, 
bringing from the north colder, clearer weather. This day, therefore, 
was the turning point, and the beginning of a cold wave which was 
already felt to the northwestward of Cheyenne. The temperature at 
11 p. m., March 24, was 47° at Saint Louis, 42° at Chicago, 50° at Des 
Moines, 37° at Saint Paul, and 32° at Moorhead. 
This was the last day of the warm wave which commenced on the 
evening of March 21, and the birds made the most of their opportunity 
aud advanced a whole degree farther north. The hosts which had 
rested during the night of the 22d moved forward and fully ocenpied 
all the country up to latitude 45°, with an innumerable host along the 
Mississippi River at 45° 25’, and scouts up even to 47° on the Mis- 
souri. 
