40 On definite Proportions, 
Kk 
os in the expression 3m.y.X.m. >. 
hy —X.my Xm = express that which is 
given by combining each body with itself. Thus we may 
perceive that these two terms ought not to be considered 
equal to zero; which obviates Mr. Thompson’s objections, 
and redeems Laplace’s analyses from the imputation of in- 
consistency. 
July 1, 1819, 
Fhus the two terms: 
+ S.mx.y.m 
Vill. An Attempt to determine the definite and simple Pro-~ 
portions, in which the constituent Parts of unorganic Sub- 
stances are united with each other. By JacoB Brrzk- 
Lius, Professor of Medicine and Pharmacy, and M.R.A. 
Stockholm. 
[Continued from vol, xliv p. 415.] 
XVIT. ANALYSIS OF FHE MuniaTE OF AMMONIA. 
1.) Tes grammes of sal ammoniac were dried on @ 
very hot sand bath, and then dissolved in water: nitrate of 
silver was added to the solution, and the precipitate was 
dried on a filter in a temperature far exceeding that of boil- 
ing water, It weighed 26-5 gr. and consequently contained 
_4°955 gr. of muriatic acid. According to this experiment, 
100 parts of dry sal ammoniac contain 49°55 of muriatic 
acid; which nearly agrees with Rose’s result, that 100 
grains of sal ammoniac afford 266-87 of horn silver, 
2.) I mixed ten grammes of pure caustic lime in a glasa 
retort with four of sal ammoniac, very finely powdered, and 
then dried on a very hot sand bath, and luted to the retort 
a receiver filled with melted muriate of lime, in the tubu- 
iated aperture of which I fixed a glass tube filled with the 
same salt. ‘The receiver and the tube, as well as the retort, 
were weighed. The retort was gradually heated in a sand 
bath until it became ignited: hence the receiver and the 
tube hoth became warm, yet no ammoniacal gas whatever 
escaped from the tube. After the conclusion of the ex- 
periment, the whole had lost only a few centigrammes 1n 
weight; but the retort weighed 1-485 gr. less, or 37°12 
per cent. of the weight of the sal ammoniac. Instead 
therefore of 464 [492] per cent. of acid, which ought to have 
remained behind with the lime; in this case nearly 63 per 
cent. were retained; and when the retort was again heated 
until the mass began to melt, it Jost only a few centi-~ 
: grammes. 
