2] 6 . Scientific Intelligence. 
measures heights by the temperature at which water boils, was 
employed by Mr Wollaston to ascertain the elevation of Snow-, 
don and Moel Elio. The following are the results : 
Snowdon. 
Height by thermometrical barometer from the north Feet. 
end of Caernarvon Quay to the summit, - 3546.25 
Ditto trigonometrically, according to General Roy, 3555.4 
Ditto barometrically, according to General Roy, 3548.9 
Moel Elio. 
Height by the thermometrical barometer from the north Fef't. 
end of Caernarvon Quay, - - - 235 55 
Ditto trigonometrically, according to General Roy, 2371 
Ditto barometrically, according to General Roy, 2391-1 
See Phil. Trans* 1820, Part II. p. 302. 
47. Clay -slate Axe found in a Whale . — Mr John Murray 
has favoured us with the drawing forming Fig. 11. Plate III., 
and representing a piece of clay-slate which was cut out of the 
bjubbef of a whale in Davis’s Strait by the carpenter of the 
London” Greenlandman of Montrose. It had sunk to a depth 
of from 18 to 20 inches, and the wound had cicatrised. It is 
neatly ground, presenting the knife-edge, and seeths to have 
armed an Esquimaux lance. 
48 . Luminosity produced hy Compression^ Friction, and 
Animal Bodies . — Our ingenious correspondent Mr John Mur* 
ray has favoured us with the following observations and experi- 
ments on this subject : In the account of the descent of the 
Glacier of Weisshoriij (Vol, III. p. 275.) the light which is said 
to have been observed^ is considered as electrical, and as analo* 
gous to that which is developed by breaking crystallised sugar, &c. 
There are several luminous phenomena which it would be difficult 
to explain according to the usually accepted views of chemical 
theory. We may suppose some of them electrical, but the opi- 
nion would not be legitimate, until declared by experiment. 
Thus, when fulminating compounds are subjected to friction 
and percussion, or pure calomel^ oxide of lead, and sulphur, are 
suddenly compressed in a mortar, light evolves in these ; aud 
