Earthquakes. — Hopeite, a new Mineral. 463 



gained for the first time, was 13,920 Paris or 14,83564 English 

 feet above the level of the sea, they ascertained, by a trigo- 

 nometrical measurement thence made, that the elevation of the 

 highest summit of the mountain was 1680 Paris feet above it, 

 or 15,600, (16,6264 English) above the level of the sea. Thus 

 Mount Rosa is in reality the highest in Europe ; the height of 

 Mont Blanc, according to Prof. Tralles, being only 14,793 

 Paris, or 15,7084 English feet. 



EARTHQUAKES. 



On the night of the 1 Oth of April, at a few minutes before 10 

 o'clock, one of the severest shocks of earthquake experienced 

 for many years was felt at Kingston, and in different parts of 

 the island of Jamaica. The shock was preceded by a rushing 

 wind, and lasted 30 seconds, during which it was accompanied 

 by a subterranean rumbling noise. Three or four houses on 

 the north side of the island were destroyed, but fortunately no 

 lives were lost. The Jamaica Courant mentions, on the con- 

 trary, the singular recovery of a man who had been long bed- 

 ridden from rheumatism. In the alarm occasioned by the shock 

 he sprang from his bed, and from that moment was able to re- 

 sume the duties of his occupation as a brass -founder. Several 

 smaller shocks were felt between the 10th and 15th of April, 

 when they ceased. 



The Bury Post says, " On Monday morning the 31st of 

 May, about four o'clock, a slight concussion was felt by a num- 

 ber of persons in this town and neighbourhood, which they 

 compare to the shock which would be occasioned by the fall- 

 ing of a large house at a distance, but which cannot otherwise 

 be accounted for than by supposing it to have been an earth- 

 quake." 



HOPEITE, A NEW MINERAL. 



Form prismatic. Fundamental form a scalene four-sided 

 pyramid of 139° 41'; 107° 2'; 86° 49', in which the ratio of 

 the three lines AM : MB : MC -a : b : c is =1: V *-443 : 

 VI "*93. 



Incidence of Jl/on Mover g = 101° 24' = Pr; 



of 5 on 5 over / = 81° 34' =(Pr+ oo ) 3 . 

 Cleavage perfect parallel to Pr+ oo (/), less distinct parallel 

 to Pr-f oo (p). Surface of Pr+ oo deeply striated in a verti- 

 cal direction, the other faces smooth. 



Effraction double ; two axes, the principal one perpendi- 

 cular to the axis of P, and also to /. Action of the axis ne- 

 fative. Angle of resultant axes about 48° in the plane of 

 * — oo ( g ), contiguous to the obtuse lateral angle of P. In- 

 dex 



