1864.J 



409 



[Chase. 



conjectural results, which appear to uie to be more satisfactory and 

 philosophical than any that have been heretofore obtained. 



The theoretical maxima of the rotation tide, allowing an hour for 

 the lagging of inertia, occur at 4h. and 16h. j the minima, at 10 h. 

 and 22h. The solar attraction maxima, with the same allowance, 

 should be found at Ih. and 13h. ; the minima, at 7h. and 19h. If 

 we assume that the attraction tidal curve is symmetrical, and regard 

 all the deviations from symmetry as occasioned by differences of 

 temperature and vapor, we may readily construct the following ap- 

 proximate 



DAILY BAROMETRIC TIDAL TABLE. 



Imperfect as these first approximations confessedly are, and probable, 

 nay, almost certain though it be, that a large portion of the residual 

 tide should be transferred to the temperature and vapor column, f yet 



* The sum of the tides, + the mean height = observed height. 

 t I can see no good reason at present, for supposing the existence of a solar tide 

 greater than .002 in., which would be equivalent to .0005, .0009, and .001, at 1, 



VOL. IX. — 3c 



