= 182 G. C. Swallow on the Rocks of Kansas. 
me, three earthquake shocks here. The first, and by far the | 
most energetic, was on the last day of Feb. 1857, I think inthe 
evening. The last was on the 16th of April, 1858, about 6 — 
o'clock, A. M. : 
F. J. Prentiss, Esq., of Cleveland, Ohio, writes, ‘I have made 
repeated and thorough enquiries with reference to the earth- 
quake of which you speak, and am satisfied that it was not 
known or felt in this part of the State. Within a few w 
past, two shocks were felt in this city, at Painesville and Ashtab-— as 
ula, but I can find no one who knows anything about an earth- — 
quake in Oct. last.” S 
Hon. David Campbell of Sandusky, Ohio, writes, “I have 
made enquiries in relation to the earthquake, but have not heard — 
that it was observed anywhere west of Westfield, N. Y. 
= the facts submitted the following inferences may be 
Wn : 
1. That the maximum intensity of this earthquake was felt 
in Buffalo and its vicinity. ; 
2. That its undulations were propagated in a linear direction, BS 
= through Port Hope, Lockport, Buffalo, Jamestown and 
arren, which lie on an arc of a great circle, varying but little 
from a north and south line. 
3. That its intensity diminished on either side of this line, 
nearly subsiding at Hamilton on the west, and entirely so at 
hester and Hinsdale on the east. 
_ 4 That the limits of this line were Port Hope, C. W., which 
is situated on Lake Ontario, and some point south of Warren, Pa. 
Art, XIX.—The Rocks of Kansas; by Prof. G. C. Swattow of 
(Read before the American Association for the Advancement of Science, at Balti: 
more, 1858.) 
