SUPPLEMENTARY REPORT ON METEOROLOGY. 155 
heights. The effect of atmospheric radiation in the day- 
time, in clear and in cloudy weather. (72.) 
10. The improvement of the theory and practice of baro- 
metric measurements. 
11. The dryness of the higher strata of the atmosphere. (190.) 
12. The formation of clouds, their structure and tempera- 
ture (this last point is one of very considerable interest, 
viz. to compare the temperature of the air within a cloud 
with that of the comparatively dry surrounding air). 
13. The formation of storms, especially thunder-storms, and 
the origin of hail. Perhaps no mountains in Europe are 
so well adapted for these observations as the middle and 
western Pyrenees. 
339. Besides these and similar observations which experience 
will suggest, the traveller may often do something in the way 
of recommending local researches to intelligent persons situated 
on the spot. He may at once afford them the knowledge (which 
is all that many require) how to make their efforts useful,—the 
stimulus to exertion by undertaking to turn their labours to 
good account,—and the means by providing them with simple 
instruments, or by comparing their instruments with his own. 
Addition to Article 125. 
A paper by Dr. Richardson on the frozen soil of North Ame- 
rica appears in Prof. Jameson’s Journal, Jan. 1841. 
Addition to Article 195, on Wind. 
Since this was written, Mr. Osler presented at the Meeting 
of the British Association at Glasgow, perfectly satisfactory 
proof of the close connection which subsists between the diur- 
nal curve of Temperature and the Force of the Wind. The same 
analogy appears to have been made out by Mr. Rutherford, at 
Kingussie, in Inverness-shire (who has been engaged in hourly 
observations under the direction of Sir D. Brewster), although, 
not having an anemometer, he has been unable to give to it the 
precision of a law, as Mr. Osler has done. 
ERRATA. 
Page 39, 2 lines from bottom, for instruments read instructions. 
— 44, first line of note, for animal read annual. 
— 137, line 9, for gaz read gygz inch. 
