34 H. ROSE ON THE COMBINATIONS OF THE 
In the combinations only of ammonia with chloride of tita- 
nium, chloride of aluminium, and chloride of sulphur, does the 
quantity of ammonia exactly suffice to form chloride of ammo- 
nium with the chlorine of the chloride, when the chloride takes 
up the constituents of water; the other chlorides possess less 
ammonia. Nevertheless, we must not regard these combina- 
tions, as will subsequently appear, even after treatment with 
water, as combinations of chloride of ammonium with oxides, 
but as ammoniacal compounds of a peculiar kind, comparable 
with, and similar to the combinations of certain anhydrous 
acids, especially sulphuric acid with ammonia (sulphat-ammon). 
The solubility of most of these compounds in water, even when } 
the oxide which they contain is of itself insoluble either in water 
or in solutions of ammoniacal salts, renders this probable; but 
still more does the circumstance that in the solutions of these 
combinations the quantity of ammonia can only be partially se- 
parated, and by no means entirely, by a solution of chloride of 
platinum, as is likewise the case in the solutions of sulphat-am- 
mon and parasulphat-ammon. 
Seconp CuAss. 
To this class belong but few combinations, for it is those ra- 
dicals which form the most powerful acids with oxygen, that give 
no corresponding combinations with chlorine; at least we are}, 
not acquainted with any chlorides corresponding to sulphuric 
acid, selenic acid, chromic acid, nitric acid, molybdic acid, tung-}} 
stic acid, or arsenic acid; and several chlorides which, it is true, 
correspond to pretty strong acids, appear not to combine with 
ammonia. It is almost solely the liquid compounds of chlorine 
with phosphorus and arsenic, analogous in constitution to the 
phosphorous and arsenious acids which have here occasion to be 
mentioned. 
Protochloride of phosphorus-ammonia.—According to my ana- 
lysis it is composed according to the formula P Cl?+5 N H®,) 
and contains just so much ammonia, that when the combination 
is dissolved in water neutral phosphite of the oxide of ammo- 
nium and chloride of ammonium can be produced*. Persoz,|_ 
although he likewise states that the combination would be con- 
verted, by treatment with water, into chloride of ammonium, 
* Poggendorff’s Annalen, vol, xxiv. p. 308; and vol. xxviii. p. 529. 
