236 On the Reality of the Rise of the Coast of Chile. 
is equal to the length of the vessel, and whose breadth is equal to 
half that length, and on this rectangle construct the common parabo- 
la, so that the axis shall be coincident with one of the longest sides 
of the rectangle, the vertex in one of the angles of the rectangle, 
and the opposite short side of the rectangle coincident with, and 
equal to a semi-ordinate to the axis of the parabola; then the proper 
curvatures for certain portions of the several water lines may be found 
in this parabolic curve, and it is highly probable that all of them may 
be designated as being between certain ordinates. Perhaps a para- 
bola of greater dimensions may furnish more convenient curves. 
The writer has had some experience in the sailing of boats and 
vessels—is confident that his expectations might be realized, and 
earnestly hopes that a vessel may be constructed on the principles 
assumed. 
Art. I1V.—On the Reality of the Rise of the Coast of Chale, an 
1822, as stated by Mrs. Granam. 
Introductory Remark.—The question of the reality of the rise of 
coast of Chile, during the earthquakes in that region, in the month 
of Nov., 1822, is so interesting to geology, that we readily comply 
with the request of a much respected foreign correspondent, by insert- 
ing the subsequent papers in this Journal. As Mrs. Graham, now 
Mrs. Callcott, gave her name in support of the important statements, 
whose correctness has been recently denied by a geologist, whose 
name is deservedly respected and honored, wherever science is 
known, it is due both to the lady and to geology, that there should be 
a fair hearing, to which Mr. Greenough will be the last to object.—-Ed. 
1. An account of some effects of the late Earthquake in Chile, 
Extracted from a letter to H. Warspurton, Esq. by Mrs. Manta 
GraHam. 
London, March 4, 1824. 
Dear Sir,—I send you, at your request, some extracts from my 
journal concerning the great Karthquakes which visited Chile, du- 
ring my residence in that country, in 1822-3. 
The first shock, by which the towns of Valparaiso, Melipilla, 
Quillota, and Casa Blanca, were almost destroyed, and Santiago 
much damaged, was felt at a quarter past ten o’clock in the evening 
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