472 Scientific Intelligence. 
filtered. Two hundred cubic centimeters of the filtrate were 
taken and diluted to a liter, and the hypochlorite was determined 
by Bunsen’s method in a portion of the solution. Other portions 
were then distilled with nitric, with hydrochloric and with sul- 
sr acids. The best result was obtained with the first of these 
in the eee Sahome ee _ Hence the author concludes 
Cl ? 
chlorous oxide from bleaching powder by chlorine, is strongly 
confirmatory of the latter view. Chlorine is not set free by the 
action of hydrochloric acid upon bleaching powder. —_ —_ 
¢., If, xiii, 713, August, 1875. 
4. Method for the “ Quantitative Separation of Ferrie “Oxide 
Alumina, and Phosphoric Acid.—Having occasion to analyze & 
tion caf? peer proposed by Odling. The liberation of hypo- 
P 
rious methods in use for the separation of these sree the 
results of which are given in his paper. As a result, he 
finally to adopt the following, which gave all deatvaltes accuracy? 
The solution of the above named substances, which must not con- 
tain much free acid, is boiled for ni or three hours with an ex- 
cess of sodium hyposulphite (thiosulphate) sap filtered. All the 
iron with some of the pho sphoric acid is in the filtrate; all the 
alumina with some of the acid, is on the filter. The i iron in 
d 
so long as a precipitate is nee oduced. After standing a f 
the con! is to i filtered. ‘The phosphoric acid remains 
filter as barium phos phases ; the alumina is conta tained 1 
filtrate, from which it may be precipitated in the ordinary way 
and weighed. A little caustic soda added to the wash water pre- 
vents the solution of the barium phosphate. The barium wee 
phate is dissolved off the filter, the barium removed with sulphur 
acid, the filtrate mixed with that from the iron sulphide thor 
ic aci termined with magnesia mixture 2° 
usual. The author also points out that the corrosive action ph 
of dilute solution of sodium phosphate upon the glass. of reagel 
bottles is considerable and may be a source of error in analysis. i 
| is salt cannot be obtained pure by recrystallization in pee 
____ Berlin porcelain from this cause.— Jour. Chem. Soc., ne Reena 
July, 1875. bison 
Sy On oe Gases enclosed in Coals.—Tuomas has “ea an mn elab- 
orate in tion of the gases occluded in coal as well as 
of 
