CONTENTS. 



MAY, 1807. 



Engravings of the following Subjects: 1. Apparatus for heating Rooms by Steam, 

 By Mr. N. Snodgrass ; 2. A new Instrument called the Astrometer. By Mr. 

 Brewster ; 3. Improved Pneumatic Apparatus. By Mr. Austin. 



I. Description of a New Astrometer for finding the Rising and Setting of the 

 Stars and Planets, and their Positions in the Heavens. By David Brewster, 

 A.M. 320 



II. Questions and Remarks concerning the best Methods of destroying the In- 

 sects which infest Dwellings and Furniture. By a Correspondent. 324 



III. Account of the Method and Advantage of heating Apartments and Manu^ 

 factories by Steam. By Mr. Neil Snodgrass. - - 326 



IV. Experimental Inquiry into the Nature of Gouty and Gravelley Concretions. 

 By Thomas Egan, M.D.F.R.S. - - - 335 



V. An Essay, Phisiological and Experimental, on the Effects of Opium on the 

 living System. By William Alexander, M, D. - - 34S 



VI. On the Methods of improving Poor Soils, where Manure cannot be had. 

 By John Alderson, M. D. - - - - 360 



VII. Description of an .Apparatus for transferring G asses over Water or 

 Mercury, &c. By the Rev. Gilbert Ausein, M. R. 1. A. - 377 



VIII. Description qf the Mineral Bason in the Counties of Monmouth, Gla- 

 morgan, Brecon, G^iirmarthen, and Pembroke. By Mr. Edward Martin. 38 1 



IX. On the Water Pits of the Glaciers of Chamouny. By a Correspondent. 383 



X. Remark by M, De Lalande on the Distance of the Stars. - 386 



XI. Observations on the Soda, Magnesia, and Lime, contained in Water of the 

 Ocean; shewing that they operate advantageously there by neutrahzmg 

 Acids, and among others the Sceptic Acids, and that Sea Water may be 

 rendered fit for washing Clethes without the Aid of Soap. By Samuel L. 

 Mitchell, of New York. - - - - 387 



