« 
hydric acid escapes, and the sulphate produced dissolves in tht 
2 surrounding aci 
ie ceed, the acid should be concentrated, and it is West to hav 
= co well dried and in powder. On adding water: to the 
90 J. Nickids on the Solubility of the Sulphate of Baryta. 
sition of three samples of emery analysed, after digesti 
acias, Naxos best 
Chester, 1. Chester, 2. selected emery. 
Alumina, 6074 59°05 623 
Protoxyd iron, 39°6 40°95 371 
100°0 100-00 1000 
If this view is adopted, emery must be ranked as a di 
species, and not asa mere granular form of corundumors oe 
n conclusion, I would State that practical trials of the C 
emery, in several of the large armories and machine shops of t 
and the adjoining States, have proved it to be fully equal m 
value to the well known emery of Naxos, which I have 
doubt it will wholly supplant in this country, and that it ¥ 
ere long become an article of eal to Europe, either in its: 
aM form, or in a manufactured stat 
may "be roper to add, that a B. Taft, Esq., of Bost 
in behalt of fis associates, owners of the emery mine, has tl 
sole management of the business connected with the mine. 
_u 
as, of Chester, for kind assistance in the field.” 
82 “sent St, Boston, Dec. 12th, 1864, 
~_— XIV.—On the Solubility of the Sulphate of set in 
Sulphuric Acid ; by Prof. J. Nicki 
TE sulphates of baryta, strontia, and lime, are align 
le, as is known, in boiling sulphuric acid. I have found tl 
they are soluble in cold acid when in a nascent pas 
To obtain this result, it is only necessary to throw a 
cehlorid of barium, or of st trontium, into a sufficient — 
monohydrated. acid: the chlorid is by degrees decom 
3 
This is especially true for the chlorid of barium; but to 
Bee thus obtained, the sulphate of baryta falls as a white | 
Slo of strontium gives the same results, and the 
similar dived with Siar! Bose less 
