394 Suggestion as to the Origin of Fountains. 
taken the place of the hernblende, and numerous smail plates | 
of feldspar are scattered through this base, constituting what 
has been denominated porphyritic greenstone. i py- 
ritots copper, and green earth, exist in the same rock. 
chloropheite must be carefully diate pene from 
the vadfated chlorite, which occurs in. the same rock, in the 
same region. — The chlorite consists of folia, disposed in a ra- 
diating manner: but the chloropheeite exists in minute acicu- 
lar prisms, and may thus be distinguished. It is not always 
80 easy to. distinguish between the rusty powder of this mine- 
ral a nd the green earth. 
I take the liberty of mentioning, through the medium of 
your Journal, that I feel anxious to obtain a series of speci- 
mens illustrative of the English rock formations, along w 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 boas and Brongniart. Should any gentlemen in 
this country, or Europe, be willing and able to furnish me 
with these geological specimens, | could return as many spe- 
cimens as he should desire, of most of the follow pee minerals z 
ntitiey: eo 
A line direct 
2, ‘aaanane .—I picked up a few specimens of this mineral 
in a 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 — 
beyond the piece of quartz containing it. 
prisms, ofa flesh-red colour, and is associated with ara 
talcose mineral, as described in the first edition of Chee 
Jand?s Mineralogy. I write this notice from recollection, or I - 
= be inte 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 ite fact that, if we bore down toa sufficient depth, 
water wil te the surface and continue te flew from “the 
