382 Scientific Intelligence. 
itations of the solution of its nitrate by means of —— acid, the 
molecular weight being determined in each fracti When this 
became constant, four fractions were obtained, sack ‘of which was 
converted into sulphate and a sensibly. the same pasa 
of yttria, 48°507, 48°526, 48-497, 48-494 per cent. As a mean of 
twelve analyses ‘made on different fr bistlons, the number 48° 503 
+0°0029 was obtained as the percentage of yttria in the sul- 
phate. Taking O as 15-9633+'0035 and S as 31-984+-0°012, the 
atomic weight of Ak bp is 88°94-0°027. If SO, be taken as 80, 
the atomic weight is 89°02; or in round num 89. 
Cuive has also redetermined the atomic weight of lanthanum. 
The value which he obtained in 1874 was in round numbers 139. 
ts 0 urer pro ) 
kilograms of the mixed oxides, he converted them into nitrates, 
heated these up to » pirtial decomposition, and dissolved in water; 
thus removing entirely the cerium and thorium. The solution 
ighed 150 gr. 
aay pure. Tea! volition though colorless still showed the didy- 
mium bands. It i 
twelve atomic weight determinations, the minimum being 138°07 
and the maximum 138°35. Taking the strictly accurate values 
of O and §, oA lyase weight as a mean is seal te 
Taking SO, as 80, the value is 138-22; confirming B 
results. Cléve avilatin his former value by the great aificulty 
of driving off all the sulphuric acid in the ignition without pro 
ducing a trace of dissociation.— Bull. Soc. Ch., Il, xxxix, ae an 
pAyiiteent 1883 
5. On the Synthesis of Cryptidine.—Among the bases sbtained 
from ae tar, Williams found wi C,,H LEEDs 
; : h 
mixed with water, having an alkaline reaction. A porous 
remained in the retort. After removal of the water, the oil drie 
at 100° weighed 11 grams. It was converted into the hydrochlo- 
rate, repeatedly otvaealiioe! and then eric easy with potassium 
drate. The oil was collected, washed and again dried a t 100°. 
It boiled constantly at 270° , had a erin color and “lisagreeable 
n analysis it ga ve numbers ¢ responding to the crypt 
dine formals, The hydrochlorate sé petalilies in fine, thin co 
less tabular crystals which sublime on careful heating. The Pi 
tino-chloride falls in fine yellow needles when PtCl, in excess is 
% 
