394 Meteorological Tables. 
5.—Meteorological Tables. By M. Jutzs pe Wattes- 
rein, Corresponding Member of the Academy of History of 
adrid, and Secretary to the Russian Legation at Washing- 
ton.—We have received moir, extracted from the Trans- 
actions of the Americz an Phnlosopticl Society, in illustration 
of the tables rons in the utle of this article. 
M. Wallestein’s observations were made between the 17th 
of April, 1823, and the 24th of April, 1824, with the thermo- 
meter, the barometer, and the hygrometer; and his results, 
obtained by great care, are obviously valuable, especially as 
such observations are far from being sufficiently multiplied in 
this country. 
Those diurnal and semi-diurnal tides in the atmosphere, 
whose regular occurrence within the tropics has been fully 
established by the observations of Humboldt and others, and 
whose existence, in temperate latitudes, although with lessdis- 
tinctness and regularity, has also been ‘proved, have been as- 
certained by M. Wallestein to exist at Washington. 
In this city, it appears that the maximum of the barometer 
is at9 A. M. and its minimum at 4 P. M.; although the fluc-_ 
tuations of the barometer are far from being as regular here | 
as within ed tropics. M. Wallestein found that the mean 
ure of the months of May, June, and July, was almost 
s 
Gs Sint ne cai st 
ber and September, and the least between August and 
The mean temperature of the year was 58.5 Fah. 
a) eoerelgy 67 es Difference 
of winter, 47.9 19.6. 
The mean height of the Semcaates i 
the year was 9.92% ‘ 
during summer, 29. oot Difference 
_ during winter, 29.926 6.016. 
In 1820, ‘the ers temperature oenres at St. Peters- 
burgh , Aug. 7, was 1 Fah. at noon. 
In 1822, in *, Fah, at noon. 
uly, 
At a basta in 1823, the maximum temperature at 
noon was 95.9 Fa 
—- 1820, at Petersburgh, Jan, 18, in a piven the great- 
ane 
Was 
~~ 1823, Jan. 11, a — 
In 1824, at Washington, the Preatest ae was +-11.3 Fah. 
Ptene 
