CONTENTS 



OF 



THE QUARTERLY JOURNAL, 

 No. XVI. 



Art. Page 



I. Observations on the Medico-Chemical treatment of 



Calculous Disorders, by William Thomas Brande, 

 Sec. R.S., concluded from page 72 205 



II. Description of a Differential Thermometer. By W. 

 Howard, M.D .j 219 



III. Select Orchidese, from the Cape of Good Hope, con- 

 tinued from page 44, Vol. VI 22 1 



IV. A Letter on the Antiquities of New York, addressed 

 to the Hon. Sam. L. Mitchell, a Vice President of 

 tb^Literary and Philosophical Society of New York, 

 Professor of Natural History in the University of the 

 State, ^c. Communicated by Sir Gilbert Blane, Bart. 222 



V. Account of a Portable Gas Lamp 233 



VI. On the Manufacture of British Opium, communicated 



by the Rev. G. Swayne , 234 



VII. On the Progress of Steam Navigation in Britain .... 240 



VIII. On the Floatage of small Heavy Bodies in Air, and 

 certain Atmospheric Phenomena dependent thereon. By 



G. W. Jordan, Esq. F.R.S 245 



IX. A Letter relating to Mr. Watt's Remarks on Cap- 

 tain Rater's Experiments, ^c, addressed to the 

 Editor of the Quarterly Journal 259 



X. Journal of a Trip from St. Thome de Angostura, in 

 Spanish Guayana, to the Capuchin Missions of the Caroni 269 



XI. On a Substance produced during the distillation of 

 Coal Tar. By W. T. Brande, Sec. R.S., §-c 287 



XII. On M. Carnox's Theory of Defence by Vertical Fire 290 



