Chemistry and Physics. Ail 
in Wohler’s sae ie and has arrived at the conclusion that the yellow 
salt is the chlor an ammonium in which one equivalent of hydro- 
gen is sasdaaed, > one equivalent of palladium, and is consequently 
represented by the formula NHsPd, Cl. Miller terms the new radical 
NHsPd, palladamin which we shall however venture to change to pal- 
ladammonium, corresponding to methyl ammonium, platin ammonium, 
&e. e oxyd of palladammonium is readily obtained by diffusing 
the chlorid through water and adding oxyd of silver, or by precipitating 
a solution of the sulphate by hydrate of baryta. In this manner a pale 
yellow strongly alkaline solution is obtained, which, when evaporated 
over sulphuric acid, yields a solid pepe crystalline substance which 
is the oxyd NAsPd, 0, and which may be redissolved without decom- 
exhibits similar reactions, and it is therefore a stronger base than the 
oxyd of ammonium. 
The salts of palladammonium are most easily prepared by decom- 
posing the corresponding silver salts with the yellow chlorid. The 
author describes the carbonate, sulphate, and sulphite ; they are all 
anhydrous; the two former are in yellow octahedra. The nitrate of 
the bromid strongly resembles the chlorid and gives yellow octahedra ; 
like the chlorid these two compounds are anhydrous. 
hen the salts of palladammonium are treated with an excess of 
ammonia they pass into the salts of a second base corresponding in 
constitution to Reiset’s platinum base and represented by the formula 
2NH3 The author terms this ‘eo palladdiamin, but we shall call 
it palladdiammonium, as the termination amin has ata — arEne 
only to ammonias a and not to ammoniums. It ma be considered a 
forms salts when saturated in the cold with acids. An excess of acid, 
— particularly when heat is applied, resolves the compounds of 
palladiammonium into ammonia and palladammonium. The author 
iad the chlorid, ptotlins bromid and fluorid of this second radical, 
as well as the carbona all the salts are colorless 
and crystalline. pea R to prepare a urea in which one-fourth of the 
hydrogen should be — by eg ht proved unsuccessful. By 
substituting ethylamin for ammonia, Miller obtained new bases, the 
chlorids of which were represented by the formulas NH2(CsHs)Pd Cl, 
