72 , Scientific Intelligence. 
were tabulated. The results obtained by the different methods, 
expressed in centimeters, were as follows: 
BAS 106°21 
Weber (I) .-- 106-14 © 
Kirchhoff 105°93 
Lorenz 106719 
Weber (II) 105°47 
106°22 
The mean of these determinations is 106°02. The Congress 
decided to recommend a column of pure mercury 106 centi- 
meters in length and one square millimeter in section at the 
as Sega of freezing as the ohm. 
e light emitted from a square centimeter of platinum at be 
‘hicpeniiats of fusion was adopted as the standard of light; 
it was requested that observations on earth current alee i 
different countries be sent each fies to the Litceiaxiarel ating 
of gples raph Administration at , 
A Manual of Chemistry, "Physical and Inorga te as 
Saar Warts, B.A., F.R.S. 595 pp. 8vo. Philadelphia, 1884: 
(P. Blakiston, Son & Co.)—This pate by the author of the 
invaluable Dictionar ry of Chemistry, has many excellent patess 
will be found a valuable guide by students who are com- 
mencing their chemical studies. The eneral arrangement is in 
rials 
facts of phy science, more ii cabeiiially as related to ‘Chemistry. 
This portion of the work makes about one-fifth of the whole and _ 
is treated “with sufficient fallness to be of sabeactas value, 
- digression is made to chemical philosophy, and the subjects of 
chemical acai Sate ne yee ete., hinted at in 
the introduction, *xplained at length with considerable full- 
ness of illust rat: ” Winall ie ahs it elements are returned 
to and taken up in succession from the eg metals through to 
the metals of = platinum group. A vast deal of information is. 
condensed into a comparatively small fonts in this discussion of 
the chemical seca and, as was to be expected, the work 
throughout is fully up to the times. A companion volume on the 
Chemistry of Carbon. yo aorta or Organic Chemistry has also 
n published by the same author 
II. Geotoagy anp Naturau History. 
The Origin of Crystalline Rocks; by T. Srerry Hunt 
vitae act, by the Author, of a paper read before the Royal Society 
of Canada, at Ottawa, May 21, 1884.)—The author began by 
Pele Stl eee Tae 
ae Te Se aa 
E. 
; 
Sarat 
a ¥ 
Sang) hist #1) ye 
seeds 7 ean 
