26 



127. An Instrumeiit for distinguishing Precious Stones and 

 Minerals.— By Sir David Brewster, K.H.. F.R."S., &c. &c. 



1S8. Levelling Staves for taking Surface and Subterranean 

 Levels. — By Thomas Sopwith, F.G.S. — The arrangement of the 

 springs in these staves admits of their being fixed at any required . 

 height, with great ease. 



129. Model of the Workings and mode of Ventilatioji in 

 Mmik-Wear mouth Colliery. — By George Elliot, Viewer. — This 

 model shews the coal in its true position with the faults which 

 traverse it on a horizontal scale of 99 feet to an inch, and 12 feet 

 vertical to an inch. 



130. Model of France, in Papier Mache, presenting the in- 

 equalities of the mountains. — Deposited by T. Sopwith, Esq. 



131. Model of an Apparatus for Ventilating Coal Mines. — 

 By W. Fourness, Leeds. — This apparatus acts on the principle 

 of exhaustion. 



132. 1,600 Specimens of Dried Plants. — Mr. Wells, Durham. 



Newcascle-iipon-Tyne: Printed by John Hernaman, 19, Grey-Sti-eet. 



