E.. Loomis— Observations of the U. S. Signal Service. 19 
erable; in which the low center was pretty sharply defined; 
in which no neighboring low center is represented on 
Hoffmeyer’s maps. Cases 9 to 21 have been derived from the 
charts of the Deutsche Seewarte, and all have been carefully 
compared with the International Observations, excepting No. 
21, for which the International Observations have not yet been 
received. Of these 21 cases, 14 advanced towards some point 
etween north and west, 8 advanced towards some point 
between south and west, and 4 advanced almost exactly west. 
I have endeavored to compare the force of the wind on that 
side of each low area towards which the storm was advancing, 
with the force on the opposite side according to the observa- 
tions delineated on Hoffmeyer’s charts. The number of the 
following shows the comparison of the observations within the 
isobar 750 for cases 3 and 6, the force of the winds being rep- 
resented by the numbers of Beaufort’s scale (0 to 6). 
a Rear. Front. Rear. 
1876. April 19 1-76 £24 1876, Sept. 10 2°20 8°33 
Sept. 9 150 Sept. 11 1°83 2°87 
Thus we see that on the rear of these low areas the average 
force of the wind was 88 per cent greater than on the front side. 
‘The following summary shows the state of the barometer on 
the east side and also on the west side of storms Nos. 1-8 an 
Nos, 15-20. 
On the East side of the low area.| On the West side of the low area. 
775 on the north and east increas- | 29-4 to 29-0 in the United States. Iso- 
i 
ing to 780 on the northeast. bars protruded westward. 
2 | 735 on the east. 29°6 to 29°2 near Newfoundland. 
3 | 770 on the east, 755 to 740 near Newfoundland. 
4/765 to 770 on the east. 29°6 in the United States. Isobars pro- 
uded westwar' 
5 | 770 on the northeast side. 755 to 745 near Hudson’s Bay. 
6|770 on the east and 750 on the| 765 to 770 on the west, with 755 to 735 
rth-northeast. near Newfoundland. 
7 | 765 on the east and southeast. 755 to 750 on the north 
8 | 770 to 775 on the east. 
west. 
Subordinate low (735) near South Green- 
land. Also 745 in the United States. 
15 | 30-4 to 30°6 on the east. 29-7 to 29°4 near Newfoundland. 
16| Barometer slightly below normal 29°T7near Greenland. 
throughout nearly all of Asia. 
17 | 30°6 on the east. 30°2 falling to 30°0 on the west. Also 
29°6 near Newfoundland. 
18 | 30-4 on the southeast. 30°4 on the sou 
19 | 30-4 on the east, 
20 | 30°8 to 31-0 on the east. 29°8 to 30°0 ‘on the west and northwest. 
Tn all but two of these cases there was an area of high pres- 
sure on the east side of the storm center, and in several of the 
cases this pressure was above 30°5 inches. Such a pressure is 
