


668 NATURAL HISTORY MISCELLANY 
, The work will be published in quarterly parts. Each part will contain 
eight beautifully colored lithographs, with acc companying letter-press. 
The whole work will contain about eighty plates, and will be completed 
in eleven parts. The first number is announced for January, 1870 
THE GEOLOGY OF ALASKA.* — The most interesting results of Mr. Dall’s 
explorations are the determination of the facts that west of the 105th 
egree of longitude the Alaskan coast is rising, that the former violence 
of volcanic forces is diminishing throughout the resco and that there 
are no evidences of general gincisl action. Mr. Dall has travelled thirteen 
of a general ie QUE cunda Sheet, and the theory of floating ice. In 
: 1 : 
northern slope of the —— Mountains Me all the rest of North- 
eastern America must have been covered by 
If Alaska was discas by the waters of eo Pacific, why did not the 
floating icebergs score the surface, and if it was out of water during the 
glacial epoch, why did not the great terrestrial glacier of the east have its 
counterpart in the Arctic valley of the Yukon? 

NATURAL HISTORY MISCELLANY. 

BOTANY. 
‘SPONTANEOUS Morion OF PROTOPLASM.— Professor J. B. Schnetzler 


n 
l e that they are found only in living protoplasm. Professor 
ias Bose: believes that the principal cause which provokes the motion 
Sea MEM PEE ETE EE Aue ru ee i RI 


qo fne Geolory of Alaska, by W. H. Dall, 8vo, pamph., 12 pp. From the —— 
Survey. 

