116 REPORT—1840. 
Boussingault finds a contrary result in the tropics*; but this 
fact admits of easy explanation, for the height to which they 
were carried had already passed the region of maximum humi- 
dity, above which, no doubt, increased dryness occurs :-— 
Metres. Inches. 
Marmato . . . 1426 171°2—154°4 in 2 different years. 
Santa Fé de Bogota 2641 100°3 
230. Boussingault also notices that, between the tropics, it 
rains more in the night than in the day, which is the contrary 
of the case in Kuropet. 
231. Where M. Osler’s self-registering gauge is employed, we 
have the best means of determining the distribution of rain 
and the intensity of showers. 
232. On the somewhat vague subject of the moon’s influence 
on rain and weather, I must content myself with referring to 
the recent Memoirs of Aragot, Brandes §, Baumann]|, Eisen- 
lohr ], Howard**, Kamtztt, Marcet{{, and Schubler§§. 
|. 
233. This subject has made scarcely any progress during the 
last years. The experiments of Schubler are still the best we 
possess. M. Arago has collected a number of important facts 
respecting thunder-storms, and drawn conclusions from them, 
for which we refer to his popular treatise (J. Colladon, of 
Geneva, has proposed to make observations on atmospherical 
VI. ArmosPHERICAL ELeEcrricirTy || 
* LT’ Institut, No. 148. 
+ See also Schouw on the distribution of Rain.—Edinburgh Philosophical 
Journal, July, 1836. 
~ Annuaire, 1833. 
§ Ueber die Verschiedenen Formen der Wolken, thre Bildung, die Entste- 
hung des Regens und Hagels, §c.—Beitrage, p. 285. 
|| Untersuchungen iber die Monatliche Perioden in den Verdnderungen 
unserer Atmosphare.—Tubingen, 1832. 
q Poggendorff, xxx. 72; xxxv. 141. 
** Proceedings of Royal Society, March, 1840. 
++ Lehrbuch, iii.411, &c. tt Bibliotheque Universelle, Fev. 1834. 
§§ Einfluss des Mondes auf die Verdnderungen unserer Atmosphdre. Leip- 
zig, 1880.—Kastner’s Archiv, v. 169. 
\||| See former Report, p. 252, and Mahlmann, p. 209, where the subject is 
very fully treated. I beg again to disclaim any depreciation of the importance 
of subjects like the present, over which I may pass very lightly, partly on 
account of the extent of this report, but chiefly because of the difficulty of 
establishing any general principles, and of offering any definite suggestions for 
their advancement. 
q9 Annuaire, 1838. Translated in the Edinburgh Philosophical Journal. 
