A. D, Bache on the influence of the Moon, 



I the 



The epoch of the horizontal force tide for the high values is 

 nearly two hours after the culminations, and for the low values 

 it is seven and a half hours after the same phases. 



For Makerstoun in Scotland, at Sir Thomas M. Brisbane's ob- 

 servatory in 1813-46, Mr. J. A. Broun found (Trans. Koval Soc. 

 Edinburgh, vol. xix, p. 2, 1849) the smaller maximum of the 



iitul force 



-irs alter the upper cumnnation, me 

 r and a quarter after the lower culmin- 

 ation; the smaller minimum eight hours after the upper culmin- 

 ation, and the greater minimum nine hours after the lower cul- 



At Prague all extremes appear from two to three hours later. 

 Mr. Kreil (Denkschriften of the Imp. Acad, of Sciences at Vi- 

 enna, vol. v, 1858) found frotn the ten years series at Prague 

 (1810-49) maxima of horizontal force between four and five 

 hours after the upper an lower culminations, the latter being the 

 greater of the two', and minima between ten and eleven hours 

 after the same epochs, that after the upper culmination being the 

 greater of the two. 



From the Toronto observations Major General Sabine dedu- 

 ced a formula giving a curve of which the general features are 

 in exact accordance with those deduced from the Philadelplna 

 observations, namelv, a principal maximum after upper culmin- 

 ation, followed by the secondary minimum; the secondary max- 

 imum after the lower culmination followed by the principal mm- 

 imum. The times and amount of these values are compared m 

 the following table (No. 10). 



rce, as deduced from 22045 c 

 and an d<^duced' from 84303 o 

 at Toronto, Canada. 



." :;pH:ctvr~' 







1..P. r„,.h._n;-SI5S~: 



^T"':'E"„;'il.';:;; 







An,„-„t .,t pri„. mnx 



^E^, 1 



