E.. Loomis— Observations of the U. 8. Signal Service. 9 
mined the times of barometric minima at these three stations. 
The result is shown in the following table, where the numera 
1 following a date denotes the 7.85 A. M. observation ; 2 denotes 
the 4.35 p. M. observation; and 8 denotes the 11 P. M. observa- 
tion. When the pressure at two successive observations was 
sensibly the same, I have taken the intermediate date as being 
ference between the date of minimum on Mt. Washington and 
the half sum of the dates at Burlington and Portland expressed 
in units of eight hours. 
Barometric paises ie Burlington, hes Portland, Me., and 
Mt. Washington, 
Burl’n. | Porti’d.| Mt. W.| Diff. Burl'n. | Portl’d.| Mt. W.| Diff. 
1872. d. da. a. 1873. a. ad. d. 
Oct. | 14.14] 14.14] 14.2 | +05 |[Dec. | 26.3 | 26.3 | 26.3 0-0 
27.1 | 27.1 | 27.1 0-0 28.1 | 28.1 | 28:2 | +10 
Nov 71 2 | 7.3 | 415 || 1874 
12.2 112.3 | 13.3 | +0°5 |Jan. 8 2 24} +0°5 
14.3 | 34.33] 15.1 | 40-7 10.1 | 10.2 | 10.2 | +0 
30.1 | 30.1 | 30.1 0-0 15.2 | 15.24| 161 | +1°7 
Dec. $3.) 82>) 84-265 93.1 | 23.2 | 23.2 | +05 
9.1 3 | 10.1 | +2°0 98.1 | 28. 15 
27.2 | 27.2 | 98.1 | 42°0 Feb. | 10.24} 10.3 | 11.14] +17 
1873. 13.8 | 141 1 | +05 
an. S3° 33 1 -44-P es 69} 168 | 124 141 
5.3 | 6.3 | 6.1 |+41°0 ||March| 41 | 42 +05 
SES 1 23.) FEST Peon 1 | 10.14; 101 [| +12 
27.2 | 27.3 | 27.3 | +06 19.2 | 19.3 | 20.14| +20 
Feb. 42 | 42 | 4.24] +0-2 22.3 | 23.1 1 | +0% 
S14. 8b bb a: ee 96.2 | 26.3 | 26.3 | +0°5 
21.24) 21.3 | 22.2 | 41-2 ||April | 3.1 | 3.2 | 3.2 | +05 
March} 3.2 | 3.2 | 3.3 | +10 15.2 | 15.2 | 161 2-0 
8.24| 91 | 9.1 | +07 91.1 | 21.1 | 21.14] +05 
16.1 | 16.14] 163 | 41:7 96.1 | 26.1 | 26.1 0-0 
21.13) 21.14] 21.24| +1-0 30.2 | 30.1 | 30.2 | +0 
23.2 | 23.3 | 941 15 ||May 5. 5.2 +12 
26.2 | 26.3 | 27.1 | +15 25.24] 25.3 | 25.34 +0°% 
29.3 | 30.1 | 30.1 | +0°5 31.23 | 31.2}; 32.1 | +1 
111 315 | 93; +0°5 |June 7 8.1 8. +12 
April | 1 14.2 | 14.1 |—1°0 17.24 | 17.34| 17.34 | +0°5 
19.13} 19.2 | 19.3 | 41-2 9 | 23.3 | 241 | +1°5 
25.34 | 26.14| 26.1 0-0 8.2 | 28.2 | 283 | +10 
May | 13.1 | 13.2 | 13.2 | 40° |[Aug. | 12 | 1.2 | 1.2 
4.14! 242 | 949 | 40-2 ISept. | 30.1 | 30.1 | 30.2 | +10 
June | 4.93/ 4.93] 433/410 llOct. | 22 | 2.2 | 23 | +10 
9.3 | 20.2 | 20.2 | 41-0 10.24 | 10.3 419 
Sept. | 12 | 1.2 | 21 | +20 17.34| 18.2 | 18.34] +2°2 
Oct. 1] 71 | 71 | 0-0 Nov, | 10.34] 11.1}| 113 | +20 
12.1 | 12.2 | 498 | 416 0.3 | 20. | +10 
7.1 | 27.2 | 27.2 | +05 3.9 | 93.3 | 23.34) +06 
Noy. 8. 8:24 8f b410 29.14 | 29.13; 29.2 | +05 
12.3 | 32.3 | 13.14] +1 ‘Dec. "2 | 17.3 | 18.1 | 415 
18.2 | 18.2 | 18. 0-0 | 24.14| 24.2 | 24.2 | +0°2 
Dec. | 4.1 | 42 | 4:23] 41-0 | 1875. 28 
wu £oS.2 1.138 | 195 1408 Jem 23 $2 23.44% 
