INDEX. 271 
Hyacinth, description and uses of, 30 
Hydrogen, 19 
I. 
Inflammable air, 19 
Ink, indelible, for marking linen, how made, 181 
-, sympathetic, how made, 222 
Instantaneous light, matches and bottles for procuring, how made, 
145 
Iron, description and uses of, 190 
, mines, account of, 190 
, how extracted from the ore, 191 
, cast iron, what, and uses of, 191 
, wrought iron, how made, and uses of, 191 
, how preserved from rust, 193 
, native, account of extraordinary masses of, 197 
, magnetic, or loadstone, description and uses of, 197 
, white, what, 201 
pyrites, description and uses of, 198 
- , how to gild on, 172 
, sulphat of. See Vitriol, green. 
J. 
Jade, description and uses of, 88 
James's powder, of what made, 217 
Jargoon, description and uses of, 29 
Jasper, description and uses of, 60 
" , various kinds of, 61 
, agate. See Agate. 
Jet, description, properties, and uses of, 158 
-- , imitation of, 160 
K. 
Kaolin, what it is, and how made, 74 
Ketton stone, description and use of, 114 
L. 
Labrador felspar, description and uses of, 69 
Lapis lazuli. See Azure stone. 
Lapis ollaris, description and use of, 90 
Lazulite. See Azure stone. 
Lead, description of, 203 
mines, account of, 203 
how extracted from the ore, 403 
pig lead, what it is, 204 
ancient arid modern uses of, 204 
injurious effects of leaden vessels, 204 
alloys and oxides of, 205 
silver, how obtained from, 178, 207 
white, how manufactured, and uses of, 205 
