P. E. Chase on Aerial Tides. 227 
deposition of moisture, and other meteorological phenomena. 
As the height of the wave varies with the changing phases of 
€ moon,’ its effects must likewise vary, in accordance with 
mathematical laws, the proper study of which must evidently 
orm an important branch of meteorological science.” 
__ Besides this daily wave, there appears to be a much larger, bu 
hitherto undetected, weekly wave. Mr. Flaugergues,’ an astron- 
Omer at Viviers in France, extended his researches through a 
Whole lunar cycle, from Oct. 19, 1808, to Oct. 18, 1827, and he 
inferred, from his observations: ; 
_1. That, in a synodical revolution of the moon, the barometer 
Tises regularly from the second octant, when it is the lowest, to 
the second quadrature, when it is the highest, and then descends 
to the second octant. 
2. That the varying declination of the moon modifies her influ- 
ence, the barometer being higher in the northern lunistice than 
in the southern. 
8. That the action of the moon also varies with its distance 
from the earth, the mean barometric height being less in perigee 
nin apogee, se 
The observations indicate the following average meridional 
fluctuations of the barometer: : 
n asemi-synodical revolution, 1°67 pert 065 in. 
isti : : in. 
. 
a n 
im the fourth ee of —-006 in.; results which appear to be 
ecisely accordant, vith 
Would be naturally anticipated from the combination of the cu- 
between about ‘9 and 1°6 feet. 
_! The heicht t ars to fluctuate 
: in i sgaliee és terse evidences of the effect of the moon’s changes 
fall of rain, see the published observations of F. Marcet (this Journal, 
= i 
-*xyii, 192); and J. H. Alexander (this Journal, [2], xii, 1). 
_ * Bib. Univ, Dee, 1827, and this Journal, xv, 174. 
