288 Experiments on Allanite. 
cerium. The solution has a sweet astringent taste: it id 
precipitated white by prussiate of potash, oxalate of am- 
monia, tartrate of potash, carbonate of potash, carbonate 
of ammonia, succinate of ammonia, benzoate of potash, 
and bydro-sulphuret of ammonia: the precipitates are re- 
dissolved by nitric or muriatic acids: ammonia throws it 
down in gelatinous flocks: zinc does not precipitate it at all. 
h. The white oxide of cerium, mentioned by Hisinger 
and Berzelius, and described by Vauquelin, did not present 
itself to me in any of my experiments; unless the white 
flocks precipitated by ammonia from the original solution 
be considered as white oxide. They became brown on 
drying, and when heated to redness were certainly cou- 
verted into red oxide, 
As cerium as well as iron is precipitated by succinate of 
ammonia, the preceding method of separating the two 
from each other was not unexceptionable. Accordingly, 
in some subsequent analyses, I separated the cerium by 
means of oxalate of ammonia, before [ precipitated the iron: 
J found that the proportions obtained by the analysis above 
described, were so near accuracy that no material alteration 
is necessary. 
8. The liquid, thus freed from iron, alumina, and cerium, 
was mixed with carbonate of soda: It precipitated a quan- 
tity of carbonate of lime, which amounted, as before, to 
about 17 grains, indicating 9°2 grains of lime. 
From the preceding analysis, which was repzated no less 
than three times, a different method being employed in 
rach, the constituents of allanite are as follows : 
SST sv amie Geerpieen, ours cyan oberg eae 
TAME 0 oa 93 Se.a hoes» sor eid tie Rein 
AMORA 36 syne Sey she (okie ho ogee 
Oxide of IFOn .02 ssw esece sen 25°4 
Oxide of certum .....-4.622+5 33°9 
W olatale gation) o4:0'¢.0. eeverstem aie "ie 
112-0 
] omit the 7 grains of junonium, because [ only detected 
it in one specimen of allanite. The excess of weight im 
ihe preceding numbers is to be ascribed chiefly to the car- 
bonic acid combined with the oxide of cerium, from which 
it was not completely freed by a red heat: I have reason 
to belicve, too, that the proportion of iron is not quite ‘so 
much as 25:5 grains. For, in another analysis, I obtained 
only 18 grains, and in a third 20 grains. Some of the ce- 
rium was perhaps precipitated along with it in the preceding 
analysis, and thus its weight was apparently increased. 
XLT Oy 
