J. M. Ordway on Sesquisals 2038 
parent, it is not easy to tell just how far we can go. In the way 
of neutralization, more than two-thirds of the acid may be sgt 
drawn, without any permanent loss of transparency. Crystals of a 
_ hitrate of chrome exposed to a steam heat till they lost 89 per 
cent of sr weight, left a dark green, tough mass, “Sd solu- 
ble in water, and having about the composition Or Ah B 
=m fetber heating, the crystals lose more acid and water, and 
spongy brittle residue dissolves rapidly in water to a very 
tp town liquid, containing chromate of chrome as well as 
the basic chlorids of chrome are more fluid and scm — the 
ni - One equivalent of chlorhydric acid has been found to 
take up six equivalents of the hydrate. The acid of re nor- 
mal chlorid may be neutralized with ammonia till there remains 
Cr2 Cls + Or,; but after this the opacity is very slow in disa pes 
ing. From the researches of Moberg, it appears that the c fo 
maintained for some time at 150° C., becomes sesquibasic an 
mains soluble, 
By the method of direct ee the iodid and the bromid 
were, without difficulty, made tribas 
While the basic chrome salts ance with the mineral acids, 
are of a deep green color, the basic acetates and formiates are 
purple, The acetate may be made tribasic, _ it is difficult to 
go further. The formiate can be made bib 
_Alumina.—When alumina is thrown down i. caustic ammo- 
hia M excess, it is very apt to be insoluble in weak aci In 
i same state as that —— bys a 
: ted alkaline solution, or that occurring in raw plastic clay.* 
is But if carbonate of — is mp we get a gelakinous preci- 
fe pitate, which, even ves in acids, with 
. the aid of heat, presen, aci aust a off. oe of sodium 
Sune “Sage itates the earth in the active conditi 
of alumina cannot, by any mode, be si more than 
on Wikons becoming turbid. 
By direct union, the nitrates, the chlorid, the bromid, and the 
very slightly opalescent. They bear dilution and boiling. ‘They 
are incompatible wih eka but allow the addition of nitrates 
or chlorids. 
manufacture of alam es} the French 
= a aga afi re 
Should ve su t, it 
meh hey sofa be that heating alumina 
re ate Seek wad teonion, Ota 
ice is i “tet mixing i 
mite hydraal by Too a either case, causes 
a union of acid and base. 
