viii CONTENTS. 



SUPPLEMENT TO VOL. XXVI. 



Engravings of the following Subjects ; Mn. Davy's new Electrochemical Appa- 

 ratus, in two Piates. 



J. The Balcerian Lecture for 1809. On some new Electrochemical Researches, 

 on various Objects, particularly the metallic Bodies from the Alkalis, and 

 Earths, and on some Combinations of Hidrogen, by Humphry 'Davy, Esq. 

 Sec. R.S.F.R.S. E.M.R.I.A. - ° - V-i 3<n 



II. On the Spinellane : and some other fossil Substances, by Mr. Nose 339 



III. Researches on Acetic Acid, and some Acetates : by Richard Chenevix, 

 Esq. F. R. S. M. R. I. A., &c. ... 340 



IV. On raising Grass Seeds, and preparing Meadow Land: by Mr. William 

 Salisbury, of the Botanic Gardens, Brompton and Sloane Street I 355 



V. On a Method of examining the Divisions of astronomical Instruments. By 

 the Rev. William Lax, A. M. F. R. S. Lowndes's Professor of Astronomy in 

 the University of Cambridge. In a Letter to the Rev. Dr. Maskelyne, 

 F. R. S. Astronomer Royal - - - - 369 



VI. A physical View of the Equatorial Regions, drawn up from Measures taken 

 and Observations made on the Spot, from the tenth Degree of North to the 

 tenth of South Latitude, between the Years 1798 and 1804, by Mr. von 

 Humboldt - - - - - ' 371 



VII. Observations on the Pleonast Spinel, particularly that of the Environs of 

 Montpellier. By Mr. Marcel de Serres - 378 



VIII. On the Nodules of Lava found in the Klingstein of the Rock of Sanadoire 



381 



IX. Chemical Examination of a Substance found in Balsam of Mecca: by Mr. 



Vauquelin - - ... - - . 283 



X. Of the Fettstein : by Count Dunin Borkowski 



