Eastern Lobe of the Ice-Sheet. — Hitchcock. 
27 
strictly superficial secondary differentiation of magnetite, from 
extremely basic primary magmatic differentiations, nearly vert- 
ical in attitude, clearly defined within compass of the super- 
ficial expanse of the basaltic eruptive. 
The following analyses of magnetite from the several lo- 
calities above referred to fairly represent the secondary pro- 
ducts as described : 
I 
II 
III 
IV 
Ferric oxide 
67.31 
28.33 
Ferrous oxide 
Magnetic oxide 
Silica 
91.13 
1.79 
0.14 
CaO CO2 
0.96 
MgO CO2 
2.08 
Mn^Oa 
0.64 
0.06 
0.003 
91.94 
4.10 
0.65 
2.01 
1.03 
0.21 
" 0.0264 
3.97 
0.036 
0.030 
4 353 
Alumina 
0.220 
Lime \ 
Magnesia \ 
Manganeee \ 
Sulphur 
2.234 
1.300 
MdO 
O.'llO 
0.015 
Phosphorus 
Potash , 
0.080 
Soda 
0.230 
Moisture 
0.045 
Iron 
66,32 
66.58 
69.00 
65.896 
I. Broughton peak, Barclay sound, Otto Wuth. 
II. Money creek, Washington, Otto Wuth. 
III. Texada island, E. I. Chapman. 
IV. Redonda island, F. G. Wait. 
THE EASTERN LOBE OF THE ICE-SHEET. 
By C. H. Hitchcock. LL. D., Hanover, N. H. 
In August. 1896, I visited the Adirondacks for the purpose 
of learning the direction and extent of the ice movement. 
Geologists have rarely placed any observations of this kind 
upon record. Vanuxem states that the Adirondacks constitut- 
ed a center from which the glaciers moved outwards in ever}'^ 
direction; but presents no facts in support of this view. Pro- 
fessor Chamberlin presumes from all the data in his posses- 
sion (1883) that massive currents swept around tiiese moun- 
tains both from the Champlain and St. Lawrence valleys, 
"while a further current, at the hight of glaciation, probably 
passed over the Adirondacks, and gave to the whole a south- 
