The CONTENTS. Hi

Page

t. Separation of gold from earthy and fony bodies

by water — . - 190

3. Separation of gold from earths and fanes by

mercury - - 193

4. Extraction of gold intimately combined in the

compost ion of sands — ig$

5. Extraction of gold from the ores of other

metals - - 199

Sect. XII. Of the alchemical history of gold •- 199

1. Of the producibility of gold by art 200

2. Of the defruClibility of gold ——— 204

Sect. XIII. Imitations of gold - - — »-- 213

1. Gold coloured metal ——— 213

2. Gold coloured pigments —— 221

3. Gold coloured varniff or lacker ——— 223

Addition to the history of gold : of gold sowers on linen : of ex-tending the gold on brocades by posing them between rolls 226

m.

Experiments of the converfion of glass vessels into porcelain, and

for efab Using the principles of the art - 230

Sect. I. Experiments of the fuccejjive changes produced ingreen glass by baking • - - 233

Sect. II. Experiments of the quality of the subs anc e into which

green glass is converted by baking - 236

Sect. III. Experiments of comparing the effects of different kinds

of materials on green glass by baking - 241

Sect. IV. Experiments of the baking of different forts of glass,and of bodies approaching to a vitreous nature 245I . Vitreous andJ'emi-vitreous bodies composed of earths,without metallic or saline additions -- 246

2. Metallic glaffes . . . 247

3. Glaffes prepared with saline additions ——— 248Sect. V. Observations on the caife of the change which green

glass undergoes from baking — ■ 251

IV.

Of the expanfon or contraClion of certain bodies at the time oftheir faffing from a said to a solid fate - 256

V.