No. 385.] REVIEWS OF RECENT LITERATURE. 87 
Peterson’ as being represented by specimens in the Natural History 
Museum at Hamburg. An analysis gave : 
SiO, AlO FeO MnO MgO CaO K,O NaO H,O Total. 
76.68 14.49 1.09 tr. 84 1.53 1.20 3-92 +36 = 100.11 
The rock is a colorless glass ome numerous globulites, etc., 
arranged in flowage lines. 
GEOGRAPHY. 
Map of Alaska.— There has recently been published, by the 
United States Geological Survey, a Map of Alaska, on a scale of 
I: 3,600,000. The map is printed in colors, showing the location of 
gold and coal, and the distribution of principal gold-bearing series. 
There are also inserted a map of the principal trails to the head- 
waters of the Yukon and a map of the Klondike Gold Region, both 
on a scale of 1: 1,447,000. A descriptive text contains sketches of 
the geography and geology of Alaska, with an account of the gold 
fields and the routes to them. 
The German Deep-Sea Expedition. — We copy from the Geo- 
graphical Journal the following account of this expedition up to last 
November : 
“The German Deep-Sea Expedition of 1898 started under the 
most favorable auspices as regards the vessel itself, the arrangements 
made to adapt it for carrying on deep-sea investigations, and for the 
accommodation of the members of the scientific staff, and the appa- 
ratus and appliances to be used in carrying on the work, which are 
of the latest and most approved description. The ‘ Valdivia’ is about 
the same size as H. M.S. ‘Challenger’; she steams ro to 11 knots; 
— the bacteriological, chemical, and biological laboratories and work- 
rooms are commodious and well fitted up; the cabins occupied by 
the scientific staff are large and handsome, the principal cabin con- 
taining a splendid scientific library, including a complete set of the 
Challenger Reports, and there is ample accommodation for storing 
the marine and other collections made throughout the cruise. 
“ Prof. Carl Chun, professor of zoology in the University of Leip- 
zig, the originator and leader of the expedition, is accompanied by a 
staff of eleven scientific men, to assist him in carrying on the various 
1 Brauns, R. Neues Jahrb. f. Min. etc., vol. ii (1888), p. 156. 
