CONTENTS. 



Art. I. Biographical Memoir of the late William Henry, 

 M.D., F.R.S. and G.S., Vice-President of the 

 Literary and Philosophical and Natural History 

 Societies of Manchester, &c. By William 

 Charles Henry, M.D., F.R.S. and G.S., . Page I 



n. Analyses of Basalt and of Lava from Etna. By A. 



Lowe of Vienna, . . . • 22 



HI. Remarks upon the Maculla Hot Spring in Arabia, to- 

 gether with some Notes regarding the Red Sea 

 Islands. By W. Hibbert, M.D., Assistant- 

 Surgeon of 2d or Queen's Royal Regiment. Com- 

 municated by Sir James M'Grigor, Bart., . 30 



IV. On the Fallacies of the Rotatory Steam-Engine. By 

 John Scott Russell, Esq., M.A., F.R.S. Ed., 

 Lecturer on Natural Philosophy. Communicated 



by the Society of Arts for Scotland, . ^5 



Class I Rotatory Engines of Simple Emission, • ^0 



II Rotatory Engines of Medial Effect, . 42 



III Rotatory Engines of Hydrostatical Reaction, 43 



IV Rotatory Engines of the Uevolving Piston, 44 



V Revolving Mechanism substituted for the Crank, 45 



V. On Metallurgical Phenomena as illustrative of Geo- 

 logy. By Professor Hausmann of Gottingen 

 Communicated by the Author. (Concluded from 

 Vol. XXni, p. 330.), ... 65 



VJ. Memoir concerning the Effect which the clearing of 

 Land has in diminishing the Quantity of Water 

 in the Streams of a District. By M. BoussiN- 

 gault, . . . . 85 



VII. On the Tiee which produces the Gamboge of Com- 

 merce. By Robert Wight, M.D. Witli Re- 

 marks by Dr Graham, . 106 



