JOQ Commercial College. 



tions of- thefe fphcroids on any point of fpace will prcforveiliQ 

 Fame ratio. 



Thefe general theorems, when the queftion relates to re- 

 volving fpl^erqids, are modified in the following manner : 



To have the attraction of a revolving fpheroid on any 

 point of fpace, it will he fufficient to know thefe attractions 

 on any point of a right line perpendicular to the axis of re- 

 volution, and drawn through a point, taken at pleafure, in 

 that axis. 



If two revolving fpheroids are fuch that their attractions 

 on any point of the fame ftraight line, fubject to the pre- 

 ceding; conditions, are to each other in a conftant ratio, the 

 attractions exercifed by thefe fpheroids on any point of fpace 

 will retain the fame ratio. 



C. Biot applies in fucceffion various theorems to any 

 elliptical and revolving fpheroids, and thence deduces the 

 well-known theorems; then transforming, in a general 

 manner, the variable quantities of his formulae, he con- 

 cludes, that to have the attraction of any fpheroid on any 

 point of fpace, it is fufficient to know, for the points of any 

 Surface that may be afilimed at pleafure, the two firft terms of 

 the development of the function which expretTes the fum of 

 the moleculae of the fpheroid divided by their diftance from 

 the point attracted; and that, if there are two fpheroids, the 

 attractions of which on the fame points of that furface are to 

 each other in a ratio independent of the primitive co-ordi- 

 nates, the attractions of the two fpheroids on any point of 

 the fpace whatever will be to each other in the fame ratio. 

 He concludes his memoir by the application of thefe laft 

 theorems to revolving fpheroids. 



'' ■■ I ~ ■ ; ' ■- ■ • " ■ ' ■■ ?• - 



LI. Intelligence and Mifcellaneous Articles, 



COMMERCIAL COLLEGE. 



JLV1 ANY of our readers will perufe with fome degree of in- 

 terclt the following propofals for eftabhfhing by fubfeription 

 a commercial college at Hull. It would give us much plea- 

 fure to be able to announce that fimilar inftitutions were 

 about to be etlabiiflied in other places. 



<: The object of this institution is, to obtain for the man 

 of Dufihefs precile information on the nature and value pi 

 every article of commerce, whether the raw material or manu- 

 factured : to point out to him the country where fuch articles 

 may beft be procured : to bring him acquainted with, the 

 various proceffes by which they are rendered marketable : 



and, 



