136 Miscellaneous Intelligence. 
much more sensibly at a point above the earth’s surface than enigne d 
upon it. An instance illustrating this had come within 
knowledge. The e yh pe which destroyed the areca i ‘of 
Guadaloupe was felt in the city of New York, but only in the fourth 
story of a printing office. The sound generally precedes the shock, as 
has been observed in this country Nor merica, tbe undulation 
is always parallel to the physical features of the continent, making it 
pensooete to believe that through a long series of epochs the motion 
s been in one rather than various directions, as supposed by Elie de 
an There are two movements in earthquakes; an undulating 
and a molecular movement. ‘The latter, Prof. Rogers thought was the 
co 
S, 
movement, causing the sudden shocks which are so destructive. 
Prof. Rogers gave an account of some of' the opinions of geologists as 
to the thickness of the earth’s crust. He gave it as his own opinion, 
that in most places it is not more than ten miles thick. 
he Koh-i-noor Diamond, (froma Lecture by Prof. TENNANT.)— 
On closely examining the Koh-i-noor Diamond at Buckingham Palace, 
in company with my — the ~ W. Mitchell, I found that two of 
the larger ie were cleavage planes; one of them had not been pol- 
ished, or it had been so slightly polished that the effect was not discov- 
erable. B measuring the sione with a goniometer, and ascertaining 
the inclination of its larger faces, 109° 28’, [ ied which were 
the cleavage planes and which the cut planes of the diamond. Upon 
further examination I found two other cleavages, which make the stone 
correspond with an octahedron 
aws in the bie i-noor are 
shown in the annexed figu 
shows ag ey Sinai pee to the cleavage plane F:: this con- 
stituted oa prey danger to be apprehe nded in cutting the stone, 
cut. 's flaw seemed to proceed from a fracture marked B. 
and E were little notches cut = tes stone for she purpose of hold- 
Fr. 
racture from a blow or fall, showing at its base a cleavage 
There is every probability that the awit -I-noor-is only a portion of 
bes original diamond of that name, as procured from the mines of Gol- 
onda. My own opinion is, that in its srigiial form this diamond was 
