SIS 



iCiCNTIFIC NEWS, 



clky-slate, which affords the well known roof-slate quarries of 

 Balahelish. Thus, according to Dr. Macknight, it appears 

 that the relative positions of the great fomations, which oc- 

 cur in the Highlands ot Sco iand, correspond to the princi- 

 ples of the Geognosy of Werner. 



,- . ».^ - At the same meeting, Professor Jameson read some ob* 

 Unirersatity of ■ • p , , 



rock and me- servations on the universality of rock and me alliferous for- 

 talliferous for- niations, preliminary to a short account of some specimens 

 of a particular formation of lead ore found within fifteen 

 miles of Dunkeld in Perthshire. The fcmation appeared 

 to be almost the same with that which occurs at Strontian 

 in Argyleshire ; and it is therefore not improbable, that it 

 may prove a source of wealth to the proprietor. 

 Natiinilhistory At this meeting, likewise, the Secretary read some new 

 of the whale, and interesting observations on the nat;ural history of the 

 common Greenland whale, by Mr. William Scoresby, jun., 

 of Whitby ; and exhibited a correct drawing of that animal, 

 by the same gentleman, differing materially from the repre- 

 sentations generally seen in books. 



TO CORRESPONDENTS, 



The priricJple in hydraulics, which my correspondent whtf 

 has favoured me with a sketch of a double inverted vessel of 

 diving bell alludes to, does not appear to be capable of 

 producing the effect he expecta from it. If I understand 

 the description of his apparatus, the result would be, first, 

 that air would be driven up the tube, and from beneath the 

 Upper vessel, until the lower surface of the water had risen 

 and filled the tube ; after which the escape of air would con- 

 tinue from the upper vessel, until the surface in both vessel*"- 

 were on the same level, and at this period the included air 

 would act against the water precisely in the same manner, 

 and with no greater advantage, than in the common diving 

 bell. W. N. 



ERRATA* 



