Intelligence and Miscellaneous Articles. 79 
shown that the insulation of a sound wire-covered cable is little, if at 
all, affected by submersion. 
Finally, tables and formule are given by which the resistance of, 
or the loss through any new cable coated with gutta percha, may be 
at least approximately estimated :— 
TaBte_e I, 
Specific Resistance in Thomson’s Units of the Red Sea Covering at 
various Temperatures. 
Zinc to cable. Copper to cable. 
Tempera- /After electrification|After electrification||After electrification|Af er electrification 
ture. for one minute. for five minutes. for one minute. for five minutes. - 
60° 2162 «1017 3330 x 1017 2239 x 1017 3405 x 1017 
65 1810x ,, 2947 ,, 1720 ,, W770 
70 1460~x ,, AS 78'>< «5; ISis>s< ;, DA er a 
79 1160~x ,, BSS <5 1000~x ,, L7a9 <>, 
Taste II. 
Specific Resistance in Thomson's Units of pure Gutta Percha at 
various Temperatures. 
Zinc to cable. Copper to cable. 
Tempera- /After electrification|After electrification|/After electrification|After electrification 
ture. for one minute. for five minutes. for one minute. for five minutes. 
50 41131017 5663 x 1017 4113 x 10!” 5663 x 1047 
55 2917x ,, 3636X ,, 2917 ,, 3636X ,, 
60 2163X ,, 2549 ,, 2163x ,, 2549X ,, 
65 1634 ,, 1858x ,, 1634X ,, 1858 ,, 
70 1162x ,, 1291x ,, 1192 ,, 1291x ,, 
75 805x ,, S71 X os 780% -53 866 ,, 
80 566x ,, 613.X< 5; 548 X ,, agi xX. 5, 
“Qn Scalar and Clinant Algebraical Coordinate Geometry, intro- 
ducing a new and more general Theory of Analytical Geometry, in- 
cluding the received as a particular case, and explaining ‘imaginary 
points,’ ‘intersections,’ and ‘ Lines.’ ”’ By Alexander J. Ellis, Esq., 
BA; F.C.P.S. 
XI. Intelligence and Miscellaneous Articles. 
THE LITHIUM SPECTRUM. 
To the Editors of the Philosophical Magazine and Journal. 
GENTLEMEN, 
ERMIT me through you to ask MM. Kirchhoff and Bunsen, or 
other experimentalists in this country who may be in possession of 
the requisite apparatus, whether the “ very weak yellow line Lif,” 
