The Retreat of the Glacier. 363 
north of the Ohio may have been increased somewhat less than 
over New Englan 
From the condition of Greenland,*—a semi-continent, covered 
by a continuous glacier-mass more than a thousand miles long 
ng hose sel of gees gp tr a regard to the interior of enw are: 
(1) the explor n July, 1870, ieeetenrgedte over the ice for 28 miles, sixty 
niles pre of Jakobshawn, near te ee lel of 6 8° 20’, (Geol. Mag. for 1872); and 
(2) that of Lieutenan D. Jensen, in pete: ith Mr. A. petra. as geologist, 
who ete on the Predeikcinab glacier, be Ada the parallels of 62° and 63°, 
it travele d 4714 miles in an E.N. E. direction (Meddelelser om Groénland, Copen- 
ha . 1879, Part firs = 
= mS ERT 
The black a ice - white, land; shaded, water; J. N., 
nataks ; white lines on the black, crevasses : 
tak 
8 YX. Dalager’s 
arrow s, glacier- fay 
rdenskidld saw an nr surface of ice, whi te cw moraine le sss, much 
intersected by crevasses, and f wed by innumer able r and one “ copious, 
deep and broad riv er betw een eckan blue ice,” who ce banks he followed until th 
saw ‘the : mas s of water rush part : ape rpendicular ¢ 
depths below.” There was di portions e surface, and with it, as detected 
by his companion, Mr. Berggren, great qua ctv of am cos alge, in be 
threads of usually 4 or 8 cells, along with some Protococcus ni 
place, so much of the material lay toge ether, (alloted “ny gesians ov “dvied up) 
hat i e sun, ‘so as t a most unpleasant odor. 
like t 1at of nipardhed aci se says that om alge tenc id 
1. The height reached by Nordenskiéld 
