±o.,|^Ai;i,^malous in the double chlorides. By placing together 

 the volumes of the hydrated acids and those of the aramoni- 

 acal salts, it will be seen that the latter are made up of the 

 volumes of the hydrated acid united to amide of hydrogen 

 ^l^qting two volumes, like HCl. ,; • 



J^ai^ulphate of amraonia=HO, SO3 =2 + NH2H=2=4 



^y^J Nitrate of ammonia = HO, NO5 =3 + NH^H = 2=5 



Oxalate of ammonia =HO, C2 63=2 + NH2H = 2 = 4 



jr.)jA,n the ammoniacal salts which we have described in this 

 section may be arranged in a similar way with a like result. 



We do not profess to have resolved the cause of the equiva- 

 lency HO + NHg to KO ; nor do we insist that they do not 

 ^nter into more intimate union to form NH4O. It must not 

 f)€ left out of consideration, however, that in almost every in- 

 stance the ammoniacal salt affects one volume in solution more 

 thap the corresponding salt of potash, and that the number 

 of iVolumes of the latter becomes augmented by one in pass- 

 ing from the liquid to the solid state, while the number of 

 volumes of the ammoniacal salt remains unchanged. It re- 

 quires a more minute knowledge of the constitution of salts 

 than we now possess to decide the question at issue. 

 Dlqillura flicifSD b io qii ohr.m zi iiss a \o smuloT arit lO .0 

 lodmisn sdi lo siqiili/xn fthWeHiddti. ^'''^''^'- ' f isdmwn adilo 



.8-e 



Although we have examined many other salts than tHdse 

 described in the previous pages, with results quite confirma- 

 tory of our views, we do not feel warranted in extending our 

 memoir, already much too long. We therefore conclude by 

 summing up, in the form of propositions, the laws which we 

 consider regulate the volumes of salts. At the same time we 

 do so with strict reference to the salts which we have de- 

 scribed, deprecating their hasty generalization, being our- 

 selves quite satisfied that there are peculiarities in other cases, 

 which must be subjected to close examination. This being 

 only the first of several memoirs on the same subject which 

 we intend to lay before the Society, we do not present this 

 investigation as being in itself complete. 



Prop. I. — Compounds dissolved in water increase its volume 

 for every equivalent either by 9, or by multiples of 9. 



This, in other words, signifies that the volumes of salts in 

 solution are either equal to each other, or are multiples of 

 each other j for 9, being the volume of nine grains, or an 

 equivalent of wftterj is 1 merely assumed- as the standapd:^aft 

 cofl^parison. 



a. Certain salts, sucli as the magnesian sulphates, the 



