Chase. J 



434 



[October. 



and night at different seasons and in different years, &c.), it may yet, 

 perhaps, be discernible in comparing the results of a long series of 

 careful and delicate observations. The accompanying tables are de- 

 duced from such a comparison of the St. Helena records. 



Table I is compiled from Maj. Gen. Sabine's Tables 36, 37, 50, 

 51, 52, 53 (St. Helena Observations, Vol. II). It is specially inte- 

 resting as showing the influence of the opposition of attraction to 

 rotation in producing low solar tides at 10 or 11 p. M., the prompt 

 and direct influence of the sun upon the asthereal currents in the 

 production of a high tide at noon, the double maxima and minima in 

 each of the lunar tides, the additional confirmation of the analogies 

 that I have heretofore pointed out between the spheroids of attrac- 

 tion and rotation, the opposition of the solar and the resemblance of 



TABLE II. 



Liinar-Montldy Magnetic Tide of Horizontal Force. 



* The value of one scale division is .00019 of the Horizontal Force, in 1844 

 and 1845, and .00021 in 1846. 



