vi CONTENTS. 



MARCH, 1808. 



Engravings of the following Objects : 1. Figures to illustrate the Formation of 

 coloured concentric Rings, by Dr. W. Herschel : 2. Dr. Joseph Reade's Ca- 

 lorimeter: 3. Messrs: Allen and Pepys on Carbonic Acid, and the Diamond. 



I. Remarks on Torpidity in Animals, in two Letters from John Gough, Esq. 161 



II. On the Nonexistence of Oxigen and Hidrogen, as Bases of particular 

 Gasse> ; the Action of Galvanism ; and the compound Nature of the Matter 

 of Heat. In a Letter from G. S. Gibbes, M. D. - - 170 



III. Letter from N. R. D., containing some Remarks and Emendations of his 

 Communication in the Number for January - - - 173 



IV. On the Advantages of grafting Walnut, Mulberry, and Chesnut Trees. 

 By Thomas Andrew Knight, Esq. F.R.S. &c. - - 175 



V. Experiments for investigating the Cause of the coloured concentric Rings* 

 discovered by Sir Isaac Newton, between two Object-glasses laid upon one 

 another. By Wiliiam Herschel, L.L. D. F. R. S. - 177 



AT. Description of a newly-invented Calorimeter; with Experiments to prove, 

 that an increased Capacity for Caloric accompanies an Increase of Temper 

 rature. 'By Joseph Reade, M. D. - - 107 



VII, Experiments on the various Species of Cinchona ; by M. Vauquelin 203 



VI II. On the Quantity of Carbon in Carbonic Acid, and on the Nature of the 

 Diamond. By William Allen, Esq. F. L. S. and William Hasledine Pepys, 

 Es,q. Communicated by Humphry Davy, Esq. Secretary R. S. M. R. 1 A. 



216 



]yi. Account of an extinct Volcano in Britain. Communicated by Mr, Don- 

 ovan - - - - - 237 



Scientific News - 24& 



APRIL, 



