100 E. Loomis— Observations of the U. S. Signal Service. 
ishes as we advance eastward. At Paris this ratio is reduced 
to one and a half; and in Central Hurope more rain falls while 
the barometer is ascending than while it is descending. 
From these observations we must conclude that storms may 
travel eastward even though the center of the rain-area is some- 
(this Journ., vol. xvii, p. 12) I have shown that the change of 
stations, indicating that the west wind in the rear of the storm 
pushes under the east wind, lifting it from the surface of the 
earth, so that a change of wind and an increase of barometric 
pressure is observed at the surface before there is any change 
of wind at the elevation of 2,000 or 3,000 feet. This move- 
ment of the winds does not prevent the storm center from ad- 
vancing eastward, but the storm advances less rapidly than 
when the center of the rain-fall is considerably east of the cen- 
ter of low pressure, as is generally the case in the United States. 
Barometric minima advancing with unusual velocity. 
Dr. Neumayer finds in Europe occasional examples of baro- 
metric minima which remain nearly stationary for a few days; 
and there are other examples of minima which advance with 
extreme rapidity. ee 
On the 9th of September, 1876, there was a barometric mint- 
mum (29°06 inches) not far from Ké6nigsberg in Prussia. 
Thence it made a circuit through the southern part of Sweden 
and Norway, and at the end of six days it was in Holland 
about 720 miles west of the first named position. On the 19th 
of December, 1876, there was a barometric minimum (28°70 
inches) near the southern extremity of Ireland. Thence i 
made a circuit through England and back into Ireland, and at 
the end of six days was near Cherburg in France, less than 
500 miles distant from the point first mentioned. ce 
The following table shows all the cases in 1876 and 1877 10 
which storm centers advanced over 1000 miles in twenty-four 
ours. 
Column 8d shows the progress of the barometric minimum — 
in twenty-four hours expressed in English miles; columo — 
4th shows the height of the barometer (in English inches) é 
at the center of the storm at the beginning of the day in ques 
tion; column 5th shows the latitude of the center at the be. : 
ginning of the given day; column 6th shows the height of 
the barometer at the center of the storm at the end of the 
wind reported at any station for that day. The scale is noe ; 
