Mineralogy and Geology. 273 
American Association at Springfield, Mass., specimens of what was re- 
garded by me as an organic form externally resembling Stromatocerium, 
and found in the Laurentian limestone of the Ottawa. These were de- 
scribed by me in the Canadian Naturalist for that year, (vol. iv, p. 300 
and afterwards figured in the Geology of Canada, (p. 49). In 1863, sim- 
ilar forms were detected by the Geological Survey, in the serpentine-lime- 
stune of Grenville, sections of which we have prepared and submitted for 
aws e finds that the ser- 
nal, [2], xxxvi, 228,) that these oldest known stratified rocks, constituting 
the great Laurentian system, are probably to be divided into two uncon- 
rests unconformably upon the true Laurentian series. It is the limestones 
of this latter and more ancient division which have afforded the Foramin- 
» On Glaciers and other phenomena connected with the Himalayas ; 
(Proc, Roy. Geog. Soc., Jan, 1864.)—Dr. Falconer, after describing the 
Progress of the Trigonometrical Survey in India, next drew attention to 
the glacier system of the Himalayas. All the best observers— Dr. Thom- 
be 
A any dist h : 
Mvers which cut them across, rivers like the Indus, the Sutlej, and some 
ers of the Ganges; but, regarded in one grand aspect, they constitu- 
ies of mountains with ravines and valleys intervening. Viewed, 
then, in this light, there were two great ranges which culminated to espe- 
cially great altitudes, and which bounded the Indus river to the south 
and to the north; and this being one of the points where the Himalayan 
attained its greatest altitude, there the a phenomena were 
the greatest grandeur and upon the loftiest scale. The 
