Variation of the Needle. 
IBl 
TABLE^ containing the Mean Variation of each Twelve 
Months Observations. 
\st Year. 
Year. 
M Year. 
Morning, 24 32 28 
Noon, 24 41 14 
Evenino;, 24 34 46 
Morning, 24 34 45 
Noon, 24 43 21 
Evening, 24 37 29 
Morning, 24 32 36 
Noon, 24 40 23 
Evening, 24 34 30 
/ // 
( By the Morning observation, 2 09 1 v • // 
Decrease, -< By the Noon observation, 2 58 ^ Mean, 2 42 
By the Evening observation, 2 59 3 
f Morning, 24 SO 38 
1820, April, 4 Noon, 24 40 29 
Evening, 24 31 58 
Rain and Evaporation at Bushev Heath during the yea7's'lSVd—^{). 
1819. 
Month. 
Rain. 
Evaporation. 
Inches. 
Inches. 
January, 
1:906 
1.400 
February, 
2.828 
1.430 
March, 
1.153 
2.680 
April, 
2.468 
3.440 
May, 
3:063 
4.530 
June, 
1.950 
4.250 
July, 
1.514 
4.930 
August, 
2.520 
4.720 
September, 
3.213 
3.550 
October, 
1.610 
2.280 
November, 
1.761 
1.230 
December, 
2.429 
0.710 
Total, 
26.415 
35.150 
1820. 
Month. 
Rain. 
Evaporation- 
January, 
February, 
March, 
April, 
Inches. 
1.02 
1.143 
0.246 
1.505 
Inches. 
0.36 
0.765 
4.170 
3.750 
Barometer. 
Inches. 
Highest, 1st Jan. 1819, 30.021 N.N.E. 
Lowest, 21st Nov. 1819, 28.628 W.N.W. 
Thermometer. 
Highest, 1st Aug. 1819, 81 1 
Lowest, tlth Dec. 1819, 18 
Art. XXXI. — Proceedings of' the Royal Society of Edin- 
hurgh. (Continued from Vol. II. p. 376.) 
Mar, 6. 1820. Mk Allan read a paper on the similarity 
between the rocks of Faroe and Salisbury Crags. 
