1817.] during the Year 1816. 4% 
not come to London. I shall, therefore, insert here the remaining 
chlorates described by him in the last part of his paper. 
(1.) Chlorate of Zinc.—Chloric acid dissolves the carbonate of 
zine with effervescence; but the acid is not easily saturated by the 
oxide. The solution is very astringent. It crystallizes in short 
octahedrons. It does not precipitate nitrate of silver, and is there- 
fore a pure chlorate. Chloric acid dissolves zine without the least 
effervescence. The solution is astringent, the salt is very soluble, 
and crystallizes with difficulty. When heated in a phial, it gives 
out a mixture of oxygen and chlorine, and a white mass remains, 
which isa mixture of chloride and subchloride of zinc. When the 
salt is heated upon charcoal, a detonation takes place. ‘This salt 
precipitates nitrate of silver. It is not, therefore, a pure chlorate, 
Probably the zine is oxidized at the expense of the chloric acid. 
2.) Chlorate of Iron.—Chilorie acid dissolves iron with great 
rapidity without the evolution of any gas. Considerable heat is 
produced during the solution. The liquid has at first a green 
colour, and astringent taste; but it soon becomes red, without the 
access of air, At first it gives a green precipitate with the alkalies, 
and is scarcely tinged by gallic acid; but after it has acquired a 
red colour the alkalies produce a red precipitate; and infusion of 
nutgalls and prussiate of potash strike a green colour with it. When 
evaporated, it is converted into a gelatinous mass, like coagulated 
blood. When dried, it became transparent, and is still soluble in 
water. It does not fuse upon burning charcoal, like the last salt. 
When heated, it gives out chlorine, but no oxygen. It precipitates 
the nitrate of silver, and therefore is not a pure chlorate. Probably 
it isa compound of chlorine and oxide of iron. 
(3.) Chlorate of Silver.—This salt is easily obtained by placing 
in contact chloric acid and oxide of silver newly precipitated, and 
still moist. The salt is neutral; and when sufficiently concentrated, 
crystallizes in four-sided prisms, terminated by oblique faces, It 
dissolves in 10 or 12 times its weight of water, at the mean tempe- 
rature of the atmosphere. Its taste is similar to that of nitrate of 
silver, but weaker. When triturated with sulphur, it produces 
flame, and an intense heat. On red-hot charcoal it fuses with a 
strong flame, and leaves chloride of silver, M. Vauquelin ascer- 
tained that this salt may be formed by passing a current of chlorine 
over oxide of silver; but if the current is too Jong continued, the 
chlorate is again decomposed, and chloride of silver formed. 
(4.) Chlorate of Lead. — When chloric acid is poured upon 
litharge in the state of a fine powder, a combination speedily takes 
place. The liquid is colourless, and has a sweet and astringent 
taste. This salt is neutral, and crystallizes in brilliant plates: 500 
parts of litharge produce 740 of the dry salt. On red-hot charcoal 
it melts, giving out white fumes, and nothing remains but some 
small grains of metallic lead: 700 milligrammes of this salt strongly 
heated furnished 111 cubic centimetres of oxygen gas mixed witha 
little chlorine. This amounts to about one-fifth of the weight of 
