894 Suggestioiu as lo ihe Origin of fountains. 
taken the place of the hornblende, and numerous small pilates 
of feldspar are scattered through this base, constituting what 
has been denominated porphyritic greenstone, Prehbnite, py~- 
ritous copper, and green earth, exist in the same rock. 
The chloropheeite must be carefully distinguished from 
the radiated chlorite, which occurs in the same rock, in the 
same region. ‘The chlorite consists of folia, disposed in a ra- 
diating manner: but the chloropheite exists in minute acicu- 
lar prisms, and may thus be distinguished. It is not always 
30 easy to distinguish between the rusty powder of this mine- 
ral and the green earth. 
I take the liberty of mentioning, through the medium of 
your Journal, that | feel anxious to obtain a series of speci- 
mens illustrative of the English yock formations, along with 
their characteristic fossils, as described in Conybeare and 
Phillips’s late work on the Geology of England and Wales ; 
and also a similar series of the rocks around Paris, as de- 
scribed by Cuvierand Brongniart. Should any gentlemen in 
this country, or Europe, be willing and able to furnish me 
with these geological specimens, I could return as many spe- 
cimens as he should desire, of most of the following minerals : 
chloropheeite, siliceous oxide of manganese, spodumene, 
cleavelandite, green tourmaline, rubellite, argentine, chloro- 
phane, sahlite, and the topaz described above. A line direct- 
ed to me at Amherst, Massachusetts, on this subject, will 
meet with attention, 
2. Andalusite.—I picked up a few specimens of this mineral 
ma stone wall, in the town of Westford, Mass. near the bottom 
of the hill, east of the village, on the road leading to Chelms- 
ford. Not knowing the mineral at the time, I made little search 
beyond the piece of quartz containing it. It is in four-sided 
prisms, ofa flesh-red colour, and is associated with a radiated 
talcose mineral, as described in the first edition of Cleave- 
land’s Mineralogy. I write this notice from recollection, or Il 
should be able to be more particular in giving the characters. 
3. Suggestion as to the Origin of Fountains. 
[In a letter to the Editor, dated Oxford, Ohio, Nov. 12, 1825.] 
The singular fact that, if we bore down toa sufficient depth, 
waier will rise te the surface and gentinue te flow from the 
