CONTENTS 



OF THE 



FORTIETH VOLUME, 



Experiments which prove Plalina, when combined 



with Gold and Silver , to be soluble in Nitric Acid. 3 



An Account of some Experiments on the Combinations of 



different Metals and Chlorine, ^c 4, 83, 168 



On the Structure of the Earth 13 



New Method of making Bricks, so as to form cheaper and 

 firmer Buildings, and useful underground Drains. 14 



On the Derivation of the Scale, &c 17 



Description of a temporary Rick to secure Corn in Sheaves 

 in the Fields till quite dry; also Clover, Peas, and 



Beans • • . . 18 



On tlie Combinations of Sulphur and Phosphorus with Pla~ 



tina 27 



Description of an Acorn Dibble 39 



Examination of a Species of Plumbago from Africa. 4 1 

 A^i Bakewell in Reply to Mr. Farey's Geological, Ob- 

 servations 43 



Dr. Lambe on Arsenic 48 



On certain Points connected with the Super-position of the 



Strata of England 49 



On the Elements for reducing the Polar Distances of the 

 principal fxed Stars tvhich pass near the Zenith of the 



Royal Observatory at Greenwich 55 



Description of a new Thrashing Machine 81 



Vol. 40. Ny. 176. JDec. 1812. a 



