vi CONTENTS. 



MARCH, 1810. 



Engravings of the following Subjects: 1. Sir George Cayley on Aerial Navi- 

 gation: 2. Apparatus for procuring Potassium: 3. Dr. Wollastou's retlecting 

 Goniometer: 4. Tlie I ntei vertebral Joint of the Shark. 



I. On Aerial Navigation, By Sir George Cayley, Bart. " 161 



II. On the Use of the Camera Lucicia as a Substitute for the Camera Obscura. 

 In a Letter from Mr. 'i'. Siieldrake - - - 173 



III. On the Acids produced by treating Ginger Root with Nitric Acid. By 

 T. Le Gay Brewerton, Fellow of the Royal Physical Society, Edinburgh 177 



IV. On the Method of translbrming a Number from one Scale of Notation to 

 another, and its Application to the Rule of Duodecimals. By Mr. Peter 



■ Barlow - - - - - - J81 



V. On the Piopagation of Sound through unelastic Fluids. In a Letter from 

 Francis Ellis, Esq. « - - - - 188 



VI. Miscellaneous Observations on some Phenomena of Combustion. In a 

 Letter from a Correspondent - - - - 189 



VII. On the Process for procuring the Metal of Potassium by Means of Iron. 

 In a Letter from a Correspondent - - - 191 



VfU. Description of a reflective Goniometer. By William Hvde Wollaston, 

 M.D.Sec. R.S. - - - - " - 1!>2 



IX. Remarks upon Meteoroiosy : with a Specimen of a new Meteorological 

 Tabic. By J. Bostock, M. D^ - - - - 196 



X. On the Nature of the intervertebral Substance in Fish and Quadrupeds; 

 By Cverard Home, Esq. F. R.S. - - - 208 



XI. On expectorated Matter. By George Pearson, M.D. F.R. S. 216 



XIT. On the Nonabsorption of Oxigen in Respiration, in Reply to Mr. Acton. 

 By J. F. - - -^- - - - 229 



Xlir. Observations on the Pickle of Violets, considered as a Reagent; and on 

 the Advantage of Salting Vegetables, from which Distilled Waters are in- 

 tended to be made. By Mr. Descroizilles, Sen. - - 233 



XIV. On the Existence of Oxalic Acid in the Leaves and Stalks of the Rheum 

 Palmatum, or true Rhubarb. By Mr. B. L. - - 235 



XV. Analysis of the Aplonie. By Langier - - 238 

 Scientific News. - - - . . 23d 

 Meteorological Journal. - " • - • « 240 



APRIL, 



