INDEX. 
Gold, effects of platina on it, 
— — effects of copper on it, 
— effects of silver on it, 
— ^ — experiments on it with emery, 
— - — on its specific gravity when alloyed by various metals, 
*— — expansion and contraction produced in it by different alloys, 106 
on the variation in its specific gravity from unequal diffusion 
of the alloy, - - - - 115 
on the effects of friction, on its specific gravity, - 124 
— on the effects of annealing, on its specific gravity, - 127 
— — on the effects of rolling, on its specific gravity, - 127 
■ statement of different authors, respecting its specific gravity, 130 
on its comparative wear, when alloyed by various metals, 138 
— - — on the kind best adapted for coin, - - 185 
Gravity, -specific*, on that of gold, when alloyed by various metals, 43, gQ 
- — — - — — effects of lead on that of gold, - 104 
— ■ effects of bismuth on that of gold, - 104 
on the variation in that of gold, from unequal 
diffusion of the alloy, - - - - 115 
- — — * on the effects of friction, on that of gold, 124 
— ■ - on the effects of annealing, on that of gold, 127 
on the effects of rolling, on that of gold, - 127 
— ■ various causes of variation in that of metals, 128 
statement of different authors, respecting that of 
fine and standard gold, - - - *30 
■ — statement o‘f that of various gold coins, - 137 
Gr-e vvulle. The Right 'Hon.'Cn arles. Account of some stones 
said to have fallen on the earth in France; and of a lump of 
mative iron, said to have fallen in ’India, - - 200 
H 
Hatchett, Charles, Esq. Experiments and :observations on 
the various alloys, on the specific gravity, and on the comparative 
wear of gold. Being the substance of a report made to the Right 
Honourable the Lords of the Committee of Privy Council, 
appointed to take into consideration the state of the coins of this 
kingdom, and the present establishment and ^constitution of his 
Majesty’s mint, - - - ' 43 
Henry, Mr. William. Experiments on the quantity of gases 
absorbed by water, at different temperatures, and under different 
pressures, - 29, 274 
page 
82 
84, 93 
9L 93 
81 
96 
