CONTENTS 



OF 



THE QUARTERLY JOURNAL, 



N". XX. 



ART. PAGE 



L Observations on the Analysis of Mineral Waters. 



By W. T. Brande, Sec. R.S. ; Prof. Chem. R.I., &c. 217 



II. On some Properties of the Catenarian Curve, with Re- 



ference to Bridges by Suspension. By Da vies Gil- 

 bert, Esq., F.R.S. M.P., &c 230 



III. On Humboldt's Two Works on the Geography of Plants. 235 



IV. Hints on the Manufacture of Catgut Strings 26/ 



V. Observations on the Theory which ascribes Secretion and 



Animal Heat to the Agency of Nerves. By W. P. Ali- 

 son, M.D., F.R.S., &c 269 



VI. Account of an Optical Deception 282 



VII. A Letter to the Editor, on certain Inaccuracies and 

 Omissions in the Rev. Mr. Todd's Edition of Johnson's 

 Dictionary 284 



VIII. An Analysis of the Root of Rheum Palmatum, or Rhu- 

 barb. By W.T. Brande, Sec. R.S.,&c 288 



IX. Experiments and Remarks illustrating the Influence of 

 the Eighth Pair of Nerves over the Organs of Respira- 

 tion and Digestion. By S. D. Brougiiton, Esq., &c. 292 



X. Account of the Method of preparing a black resinous 



Varnish, used at Silhet in Bengal 315 



XI. Observations on the Chemical Part of the Evidence 

 given upon the Trial of the Action brought by Messrs. 

 Severn, King, and Co., against the Imperial Insurance 

 Company. By S. Parkes, F.L.S., M.R.I., M.G.S., 



&c 316 



XII. On the Spontaneous Evaporation of Mercury. By Mr. 

 Faraday ,....3 54 



