102 Dr. S. D. Carver on a Meteoric Stone 
over Mr. Davies’s defence of his circular comparison, and one 
or two other points. ‘ 
In retiring from this controversy, I do it with a full and un- 
qualified conviction of the perfect accuracy and completeness 
of that part of Mr. Herapath’s labours I have endeavoured to 
defend. I retire, because I am sure the further occupying 
of your pages with a subject so simple and axiomatic, will ap- 
pear to the majority of your readers unnecessary and super- 
fluous. With respect to Mr. Davies, I leave him in full pos- 
session of my esteem, and on any other subject I shall be most 
happy to see your Journal ornamented with his labours. a 
P.Q. 
Erratum in my paper, Phil. Mag., Nev. 1825, 
Page 355, Theorem, for I's (p,, q,) read Fs (pr, qu). 
XVI. Notice of a Meteoric Stone which fell at Nanjemoy, in — 
Maryland, North America, on February 10, 1825. By Dr. 
Samuet D. Carver. In a Letter to Professor S1LuiMan*. 
I TAKE the liberty of forwarding you a notice of a meteoric 
stone which fell in this town on the morning of Thursday, 
February 10, 1825. The sky was rather hazy, and the wind 
south-west. At about noon the people of the town and of the 
adjacent country were alarmed by an explosion of some body 
in the air, which was succeeded by a loud whizzing noise, like 
that of air rushing through a.small aperture, passing rapidly 
in the course from north-west to south-east, nearly parallel 
with the river Potomac. Shortly after, a spot of ground on 
the plantation of Capt. W. D. Harrison, surveyor of this port, 
was found to have been recently broken; and on examination 
a rough stone of an oblong shape, weighing sixteen pounds 
and seven ounces, was found about eighteen inches under the 
surface. ‘The stone, when taken from the ground, about half 
an hour after it is supposed to have fallen, was sensibly warm, 
and had a strong sulphureous smell. It has a hard vitreous 
surface, and when broken appears composed of an earthy or 
siliceous matrix, of a light slate colour, containing numerous 
globules of various sizes, very hard, and of a brown colour, 
together with small portions of brownish yellow pyrites, which 
become dark coloured on being reduced to powder. I have 
procured for you a fragmentt of the stone, weighing four 
pounds and ten ounces, which was all I could obtain. Various 
notions were entertained by the people in the neighbourhood 
* From Silliman’s Journal of Science, vol. ix. p. 351. 
+ This specimen is not yet received.—Amer, Epiv. 
on 
