F. W. Clarke on the separation of Cobalt and Nickel. 67 
The greatest easterly deviation was 93’ 3 P.M. and the 
ss ym westerly deviation 85' at 7° 15™ p 
eviations after midnight were lh all easterly. 
Total Force.—The disturbances of the total force were on 
the average nearly seven times what may be designated as the 
average magnitude of the latter was to that of the former in 
the ratio of 8 to 5. 
The greatest disturbance which increased the force was 11 
(the an being ‘0004) and occurred at 5° 15™ p. m., while the 
greatest disturbance diminishing the force was 23 and occurred 
at 8 P. M. 
The disturbances which diminished — force nearly all took 
place between 6 30 P. m. and midnig 
Inclination or Dip.—The reece of the dip had an 
average value of atau 15’, or 15 times the disturbance limit. 
The disturbances which increased the dip were the more num- 
erous, but those which diminished the dip were of nearly twice 
_ their magnitude. The greatest increase of dip was 35 and oc- 
curred at 10® 30° p, M., = the greatest diminution of dip was 
64’ and occu:red at 3 P 
The disturbances ices the dip arta all took place 
_ after 7 p. m., those that diminished the dip having occurr 
during the day. 
_ _ Qn the whole, the aurora, together with the magnetic distur- — 
_ bance which preceded and accompanied it, was more remarka- 
_ ble than any that have been witnessed at Toronto since Sep- 
tember, 1859. 
Magnetic cubernadne ‘Toronto, May 1, 1869. 
Le, Se Et rr 
s'939 a eee souks of Cobalt and Nickel ; 
by K WIGGLESWoRTH CLARKE, §.B. 
A.tHoueH the methods employed for the quantitative sepa- 
ration of cobalt and nickel are exceedingly exact, none of them 
sufficiently convenient for ordinary qualitatfve work. Stro- 
“mneyer’s process is tedious, and Gibbs’s modification of Liebig's 8 
method cannot be used with certainty by beginners, altho 
excellent for experienced chemists. Of the purely qualitative 
methods hitherto recommended, none are wholly reliable, nor 
particularly delicate,—probably ‘the blowpipe tests are the 
