i 
Geology and Mineralogy. 265 
further 385 and 358. Most of these lines coincide very closely 
‘with the determination of Crookes of the lines of rarefied argon; 
313, 312, however, are mercury lines. It is also noted that cer- 
tain of the lines observed by Crookes coincide with those of mer- 
cury vapor and the same coincidence is noted in the lines visible 
in daylight under normal pressure in the fluorescence developed 
during the reaction of benzene on argon. These lines develop 
themselves only after several hours with the argon saturated 
with benzene and seem to be due to one of the condensed com- 
pounds from the benzene uniting itself with the argon and mer- 
cury.— Comptes Rendus, June 24; Nature, lii, 255. 
5. The Principles of Physics, by ALFRED P. Gages, Ph.D. 
634 pp. Boston and London 1895 (Ginn & Company).—Those 
who are acquainted with the excellent features of Gage’s Hlements 
of Physics (1882) will expect to find the present volume, pre- 
pared to fill a somewhat different place, a desirable addition to 
our elementary text-books, and in this they will not be disap- 
pointed. It presents the principles of the subject from the 
didactic not from the experimental side, and it does so clearly and 
simply, with numerous fresh illustrations. The shortcomings of 
such a volume are those inevitably incident to the attempt to 
compress a subject of so vast extent into the limits of a small 
volume; the author has made, however, good use of the space 
which has been allowed him. 
Il. GroLoGy AND MINERALOGY. 
1. The Protolenus fauna ; by G. ¥. Matrnew. (Trans. N.Y. 
Acad. Sci., vol. xiv, pp. 101-153, Plates I-XI, March 17, 1895.) 
—This interesting early Cambrian fauna, some species of which 
have been described before,* has been increased to the number of 
seventy species, which were chiefly obtained from the section in 
Hanford Brook, St. John, New Brunswick, by Messrs. Gilbert 
Van Ingen and W. D. Mathews of the Geological Department of 
Columbia College and the author. The stratigraphical relations 
of the fauna may be described most concisely by reproducing the 
table of life zones of the St. John Group, the details of which 
are fully elaborated by the author in the Transactions of the 
Royal Society of Canada. 
In descending order they are as follows: 
f | Band d Fauna of Tetragraptus quadribranchiatus. 
Division 3 ef ‘¢  ** Dietyonema flabelliformis. 
cé “6 (74 
Peltura scarabeoides. 
«  * Parabolina spinulosa. 
« Lingulella radula. } Place of the 
Bretonian. 
(a4 
| Division 2 
So. 8 SOfe-c0 
Ay 
D 
P t 
z , 
3 tal 5 arrt. 
y { Johannian. a Te Star \ Olenus Fauna. 
=|) > oeiliiggeaad (o- Sininet cabin Oo 
a a «  ** Paradoxides Abenacus cf. Tessini. 
: Hb. ee & Pp. -— Etiminicus cf. rugulosus. 
Bi : 
op) TAS eate fei SE KP, —— lamellatus ef. elandicus. 
iy Tao “2 2 PaawoLenus (found in 6 and: 6°). 
‘¢ a No fauna known. 
*Trans, Roy. Soc. Can., vol. vii, sec. iv, p. 135; vol. xi, sec. iv, p. 85. Nat. 
Hist. Soc. N. Brunswick, Bull. 10, p. 34. 
