SCIENTIFIC NEWS. ?f) 



On comparing the strata above and below the greenstone, 

 with the very same strata that have been pierced through in a 

 part of the colliery where the greenstone does not occur, it v 

 appears, that the bed of slaty clay with balls of ironstone lying 

 upon the greenstone, does not materially differ from the same 

 bed where the greenstone is absent, but that the beds immediate- 

 ly below the greenstone, present very different characters where, 

 they are covered by this latter from what they do where the 

 contrary is the case. These beds are 1. Sandstone, 2 Bituminous 

 ahale, with slender seams of coal, and 3. a coal somewhat more 

 than a yard thick. Of these the sandstone is considerably 

 indurated, the bituminous shale is also indurated, entirely 

 deprived of bitumen, and is broken more or less into irregular 

 pieces, and mixed with the lower part of the sandstone bed. 

 The yard coal is also entirely deprived of bitumen, is stained 

 and irridescent on the surface of its natural joints, and is more 

 friable. These changes appear to accompany the superposi- 

 tion of the greenstone bed through its whole extent, and from 

 the circumstance of their ceasing where the greenstone termi- 

 nates, they appear to be occasioned in some way or other by 

 this bed. 



Scientific Institution, Princes Street, Cavendish Square. 

 On Tuesday, Jan. 5, Mr. Singer will begin his course of 

 twelve Lectures on Electricity and Electro-chemical science, 

 which will be continued upon each subsequent Friday and 

 Tuesday, until concluded. And on the 23d of i'eb. he will 

 begin his course of Voltaic Electricity. In addition to the 

 extensive apparatus before employed, he has now in forwardness 

 an entire new Battery of one thousand double plates, with a 

 variety of auxiliary apparatus. 



Anatomical Theatre ; Lower College Street, Bristol. 

 Mr* Thomas Shute will commence his spring course of 

 Lectures on Anatomy, Physiology, and the principles and opera- 

 tions of Surgery, on Saturday the 8th January, at eight in the 

 morning. 



Dr. Buxton will commence his spring Course of Lectures oft 

 the Practice of Medicine, about the 20th of January next. 



