415 



Finally, tables and formulae are given by which the resistance of, 

 or the loss through any new cable coated with gutta percha, may be 

 at least approximately estimated : 



TABLE I. 



Specific Resistance in Thomson's Units of the Red Sea Covering at 

 various Temperatures. 



TABLE II. 



Specific Resistance in Thomson's Units of pure Gutta Percha at 

 various Temperatures. 



III. " On Scalar and Clinant Algebraical Coordinate Geometry, 

 introducing a new and more general Theory of Analytical 

 Geometry, including the received as a particular case, and 

 explaining ' imaginary points/ ' intersections/ and ' lines/ r ' 

 By ALEXANDER J. ELLIS, Esq., B.A., F.C.P.S. Communicated 

 by ARCHIBALD SMITH, Esq. Received February 16, 1860. 



(Abstract.) 



Scalar Plane Geometry. With O as a centre describe a circle 

 with a radius equal to the unit of length. Let OA, OB be any two 



VOL. X. 2 G 



