Intelligence and Miscellaneous Articles. 23 
Basic phosphate of lime, with a little fluoride of calcium 53°04 
Carbonate of lime... 1... eee e eee ee eee eeee fa) EO 
Phosphate of magnesia.....-+--ee+e+- essere eee 1°16 
Soda, with a very small quantity of chloride of sodium — 1°20 
100: 
Marchand.—Cartilage insoluble in hydrochloric acid... 27°23 
Cartilage soluble in hydrochloric acid........+..-.. 5°02 
PU ees Ae Aish e Ate sola lols foia; Heche letmtar> i's ide mpp« A Naas SL: 
Basic phosphate of lime .......4-- ++ sees sere eees 52°26 
Fluoride of calcium .......- cece ee eee eee ee cers 1:00 
Carbonate of lime...... 0.020222 eee s et eeee ees 10°21 
Phosphate of magnesia... .... 2-22 cece cere terre ee 1:05 
ebay te Ns freee 282) Ate he dit ips cheja est ioe Voie Bie eferm eles Be 0:92 
Chloride of sodium .... eee. eee ee ee eee eee tence 0°25 
Oxides of iron and manganese, and loss...........- 1:05 
100- 
Journal de Pharmacie, Decembre 1842. 
COMPOUNDS OF PHOSPHORIC ACID WITH OXIDE OF LEAD. 
BY M. WINCKLER. 
According to the researches of Prof. Graham, phosphoric acid 
forms, under certain circumstances, three different hydrates; com- 
mon phosphoric acid (P? O° 3 H? O), pyrophosphoric (P2032) H? 0+) 
and metaphosphoric acid (P? O° H? O), the atoms of water of which 
may be replaced by a corresponding number of atoms of different 
basic oxides. It is indicated in the German translation of Graham’s 
Chemistry by M. Otto, in what manner the formation of the salt of 
silver, whether uni- bi- or tribasic, is effected by employing the cor- 
responding salts of soda and nitrate of silver. It is also stated at 
the same time, that nitrate of lead yields, in an analogous manner, 
corresponding salts of phosphate of lead. M. Winckler has verified 
the accuracy of this latter assertion. He obtained with the meta- 
phosphate, pyrophosphate and phosphate of soda, the following series 
of compounds: PbO P20? (metaphosphate of lead), 2 PbO P* O° 
(pyrophosphate of lead), 3 Pb O P? O° (phosphate of lead).—Journal 
de Pharmacie, Novembre 1842. 
NEW METHOD OF PRECIPITATING METALS IN THE STATE OF 
SULPHURET. BY M.C. HIMLY. 
This method consists in replacing, in the first operation, sulphu- 
retted hydrogen, the use of which is not free from inconvenience, by 
the alkaline hyposulphites. Hyposulphurous acid may, in fact, be 
considered as formed of sulphurous acid and sulphur ; it readily de- 
composes into these two substances, when separated from its salts 
by more powerful acids ; a mixture is then formed, in which the sul- 
phurous acid, on account of its great tendency to pass to a higher 
degree of oxidizement, at the expense of the oxygen of other sub- 
stances, is capable of replacing the hydrogen of the sulphuretted hy- 
