Chemistry and Physics. 147 
This after washing, was dissolved in HCl, precipitated with oxalic: 
g 
requiring 20 parts of water, while the hydrated salt seni 88 
parts; and further that the former must’ be preserved in ice-cold. 
water, since on raising the temperature to 20°, the hydrated salt 
was deposited. The solution of the impure sulphate saturated at 
the freezing point was heated on the water bath to 20°; an 
abundant heavy snow- eae oe precipitate of the hy- 
drated sulphate came dow amount about two-thirds of the 
total sulphates, On évaporation, the mother liquor yielded a 
second crop. By several repetitions of this operation, the sul- 
phate was obtained pure. It was again ote ‘with am- 
monia, the hydrate washed and dissolved in HCl, again precipi- 
tated and washed, conn dissolved in HCl, converted into oxalate 
<a ignite e snow-white oxide was “converted into sulphate 
this was allo ‘wed to crystallize by the spontaneous evapora- 
position Th(SO,),.(H,O),. For the estimation of the atomic 
t a weighed quantity of the pulverized salt was heated to 
ape its sa aes nei see weighed, and then again heated to a 
full white hea sulphuric oxide was entirely expelled leav- 
ing pure horn dziae which was again weighed. From the 
data thus obtained, the atomic weight was calculated. Aunuiieg 
the quadrivalence ‘of thorium, the values obtained were: Ist 
Series, 232°40, 232°43, 232°32, 232°50, 232°39, 232°52 ; mean 232°43 ; 
2d series 232 38, 232°38, 232° ” 232° 88, mean 232° 1.—Ber. a rl. 
Chem. Ges... xv, 2519, Nov 
ice 
of the action of ozon i ee ben a bran ozonized enr- 
rent of dry oxygen is passed through anhydrous ether, the ozone 
18 slowly absorbed a re remains a dense syrupy li fi iquid, mis- 
*, which is ethyl peroxide. It becomes viscous at 
— 40°, but does not sperincat wi Heated in a glass tube a portion 
distils ; ; but the experiment was terminated a a violent hae 
The formula obtained is C,H,,0, or (C,H,),O,. The au 
attention to this as a ready means ‘of forming H,O,.— ne es 
ver V, xxvii, 229, Oct., 1882. 
On Catechol-orthocarboxylic acid.—Of the six cade cee 
the formula C,H,(OH),. COOH which theory indicates, five have 
