40 Improvemenis in Physical Science (JAN. 
is not entirely soluble in water, and the solutien is sensibly alkaline. 
The insoluble portion is carbonate of barytes. 
Vauquelin endeavoured from this salt to determine the composi- 
tion of chloric acid, and the proportion of oxygen in barytes; but 
his experiments varied so much from each other, that no confidence 
can be placed in them. He found chloric acid composed of 
5) 5 of en poh aga a i beaparbes kas) Sy 46 ey OD 
CCRTGIIBG's vm orcig tare ie sien otis bien: bts Apr 
100 
and barytes of 100 barium + 7 oxygen. 
5. Prochlorate of Mercury.—tThis salt is obtained by dissolving 
protoxide of mercury in chloric acid. When the saturation is com- 
plete, almost the whole salt precipitates in the form of small grains. 
Its colour is greenish yellow. Its taste is mercurial, but weak. It 
is slightly soluble in boiling water. When heated, it detonates, and 
oxygen gas is given out; but it is chiefly converted into corrosive 
sublimate and peroxide of mercury; the chlorine combining with 
one portion of the mercury, and the oxygen with another. 
(6.) Perchlorate of Mercury.—This salt may be obtained by dis- 
solving peroxide of mercury in chloriec acid. It is pretty soluble in 
water, having a strong taste analogous to that of corrosive subli- 
mate. It always contains an excess of acid, is precipitated yellow 
by the alkalies, and crystallizes in small needles. When heated, it 
gives out oxygen, and is converted into corrosive sublimate and 
oxile of mercury. If the heat be increased, more oxygen is driven 
off, and most of the corrosive sublimate is converted into calomel. 
4. Lshall here collect Berzelius’s analyses of several salts as he 
has siated them in his paper on the Composition of Vegetable Sub- 
stances, published in the fifth volume of the Annals of Philosophy. 
Citrate of Lead. Oxalate of Lead. 
fhe ‘ Oxalicacid .. 24°54 .. 100 
Citric. acid .... 34°18 ~. 100 : ; irse si 
Oxide of lead .. 65°82 .. 190 Oxide of lead. . 75 id Pic 
100-00 100:00 
Succinate of Lead. 
Suceinic acid.. 30°9:.. 100 
Oxide of lead.. 69°1 .. 223°62 
—— 
Tartrate of Lead. 
Tartaric acid.... 37°5 .. 100 
ide of ws. 625 .. 16 ; _ 100:0 
Oxide 7 Subsuccinate of Lead. 
100-00 Succinic acid .. 13°07 .. 100 
Oxide of lead .. 86°93 .. 666 
—— 
Tartrate of Lime. 100°00 
Tartaric acid.......... 50°55 
MOURNE Sie dregs steety Cae 21°64 
Water foe oeesr oer eneses 27°81 
Acetate of Lime. 
Acetic acid.... 64°6 .. 100 
TUNG os ¢ she ere CD ONS 548 
100°0 
