382 P. E. Chase on Barometric Fluctuations. 
Table of tidal differences and ratios. 
Medien Nene Differences of Barometer. HT Ratios 
: ; 1A, Qh. Bh if Qh. 34. 
» Before 2b, “00121 | 00166 | 09207 B85 “802 q 
=s | After 2b, 00081 | 00148 | 00158 “501 905 
31, | Before 8b, * 00121 | -00155 | -00209 B79 142 
+ | After 8h, 00075 | -00142 | 00156 “481 917 
gm | Mrax, . . ~ | 00099 | 00151 | 00182 B45 830 * 
Mean ratios, "536 $41 hel 
+ Before 4h, 00225 | 00302 | -00852 639 "858 
Sy | After 4h) 00133 | 00297 | -00328 405 905 
e M3 Before 10h, 00219 | 00303 | 00352 602 861 
=x After 10h, 00136 | 00300 | 00328 415 915 L 
EA EAN, . . . | 00178 | -00800 | 00340 || °524 | -884 
) Mean ratios, “B15 "885 ji Aa 
Grand Mean, or average of Mean ratios, . .|| °525 863 
By a partial interpolation for the true time of mean tide at 
St. Helena, I obtain for the ratios of the means ‘557, °866, and 1, 
Corresponding precisely with theory at 24 from mean tide. The 
tables furnish suggestive evidences of the effect of declination, 
the varying tidal influence of attraction, when acting with an 
against rotation, and the resistance of gravity to the tidal flow 
may be constantly tending to accumulate the terrestrial sether, 
as well as the atmosphere, in a spheroid with a major axis In th 
1843, to September, 1845 (Phil. Trans, 1847, p. 48), gives for the ratios of the MEA™, 
7497, "832, and 1, which, if averaved with the mean at Girard College, gives 4°?" 
9 ‘. ea 
call this “Fresnel’s theory,” since it follow 
xtremely tenuous and elastic material = 
ppose:l to But I believe M, Fresnel has ¢ 
agreement of the hypothesis with observed 
ble remembrance. 
honora 
