AND THE INTENSITY OF MAGNETICAL FORCE. 32] 
About one and a half miles north, thirty east, from town, in a wood near four very large 
chestnut trees. Horizontally stratified limestone, not magnetic. 
Lockport, Latitude 48° 11’, N.; Longitude 78° 46’, W.; June 18, 1844, 
Calculated << 
duration 
at 60°. 
Duration Total Intensity, 
Square of the Horizontal jthat at Cincin- 
preceding, Intensity. |nati being 1000. 
of 500 
Vibrations 
Tempe- 
rature. 
Dip. Epoch of commencing 
No. of 
Need Vibrations. 
eedle. 
74°44'12"| 4 |10A.12m.018.6 A}1248.00| '79°0}1246.46)1553662.5316)993.60 
5 110 50 04 8 |1520.80) 83 0]1518.35/23805386.7225)991.55 
6 jll1 25 00 0 |1516.00) 85 0/1512.58/2287898.2564)991.11 
Mean,}991.88 1007.32 
One mile south-east of town, in a wood-land. Horizontal limestone and shale. 
Buffalo, June 23, Latitude 42° 53’, N.; Longitude 78° 55’ W. 
—2.30 
805.42 1017.01 
In a low marshy ground, about thirty rods east of the American Hotel. Lacustrine 
formation, underlaid by limestone. 
Toronto, Upper Canada, Latitude 43° 33’, N.; Longitude '79° 20’, W.; June 19, 1844. 
73°12'30"| 4 6h.26m.038.2 P}1258.00| 74° |1256.86/1579697.0596/780.56 
6 6 54 02 0 1526.00) 72 |1524.92/2325381.0064;—2.62 
778.94 
110.07 
Mean,/778.90 | 1022.58 
These experiments were made in a wood, about one and a half miles east of the Mag- 
netical Observatory. Lacustrine clay and gravel, similar to that of the neighbourhood. 
I broke the filament of needle No. 5. It will be seen above that No. 4. still reads too 
high, and its indications are not included in the result. But in the following observa- 
tions, that needle having been re-levelled, its indications became quite consistent. 
Toronto, Upper Canada, June 20, 1844; Magnetical Observatory. 
75°13'22”" 
4 |10h.43m.05s.2 A/1259.2 | 71° |1258.30)1583318.89001778.77 
5 lll 24 04 1532.4 | 75 |1530,80/2343348.64001778.77 
6 {12 00 01 2 {1528.0 | 76 |1526.00/2328676.0000/77°7..77 
Mean,|778.44 1022.95 
These observations were made in the little shed where the dip is usually taken. 
Geology, the same as at the last locality. The only objection to the geology, for a mag- 
netic station, is, that the soil contains rather an abundance of black magnetic sand. In 
obtaining the above dip, I repeated the observations several times, generally averaging a 
higher dip, even as high as 17’, but always with some obscurities or inconsistencies, 
until both needles concurred in the above result; which was, at the same time, consistent 
with the observations made yesterday, and with a mean of the results of the observatory. 
Ashtabula, Ohio, Latitude 41° 52’, N.; Longitude 80° 52’, W.; June 24, 1844. 
73°25'03"| 4 |10h.06m.00s.8 Al1198.8 | 78°0|1197.4011433766.76 859.94 
5 |10 34 04 0 |1458.8 | 77 5/1457.06'2123023.84361860.37 
6 |11 08 24 0 [1453.2 | 79 0/1450.90/2105110,81001859.59 
Mean,|859.97 | 1033.55 
Clear, wind north-west. Geology, clay and sand, of the lacustrine formation, super- 
imposed, it is presumed, on the sandstone and shale of the coal formation. Locality, 
close to the lake, and about twelve hundred feet cast of the pier or ship-landing. 
