Natural Pliiloso'pliy.’— -Meteorology. 187 
defects in the instruments employed. As observations made at 
8 A. M. give nearly the mean temperature of the day, and as 
observations made at 2 r. m, give a temperature very much 
higher than the mean, it is clear that the mean of these must 
give a result far too great for the mean temperature ; that isy 
58°.8, upon the supposition of the correctest instruments and the 
correctest observations, is far above the mean temperature of 
1822. This, then, being quite demonstrable, how comes it that 
the self-registering thermometer of Six, which gives the daily 
maximum and minimum (the mean observations of which is 
nearer the mean temperature than 8^ and 2^), should give 
for the mean temperature 55° ? This observation merits the 
particular notice of those immediately interested in the correct- 
ness of the Royal Society’s observations. — The mean height of 
the barometer for 1822 was 29°.86e3, and the quantity of rain 
18.068 inches. See Phil. Trans. 1828, Fart I. 
14. Mean Temperature of the Canaries.— The following are 
the mean monthly temperatures of St Croix, at Teneriffe, in W. 
Long. 16® 16' 48", and N, Lat. 28® 28' 30", according to the 
accurate observations of Don Francisco Escolar. 
Jan., Centig. May, 22°.29 September, 25°.24 
February, 17 .94 June, 23 .27 October, 23 .70 ' 
March, 19 .54 July, 25 .15 November, 21 ,35 
April, 19.62 August, 26 .05 December, 19.06 
The mean of these is 21°.74. Hence we have 
Mean temperature of St Croix, . . , 71°.91 Fahr. 
Do. calculated by Dr Brewster’s formula, (86°.3 sin D)— 3|, 71 .13 
Difference, 0 ,78 
15* Temperature of the Springs on Ben Nevis.— A young 
friend communicated to us the following notice in regard to the 
temperature of the springs of Ben Nevis, and which agree in a 
general way with those we have made on that celebrated moun- 
tain. He examined four of the springs ; but as one of them ran 
near the surface of the ground for a considerable distance before 
it made its exit, he did not record its temperature. Of the other 
three, one was about 1200 feet from the base, another about 
2000 feet, and the third was the well near the summit. When 
he left Fort William the thermometer stood in the shade at 56° 
