quantity of argentic iodate. , 
- €8, and the H,6 is attached. The 
Chemistry and Physics. 255 
by igniting the double chlorid_ of cerium and potassium with so- 
dium. Metallic globules weighing 50 to 60 milligrams were thus 
obtained which consisted essentially of cerium. color of ce- 
rium is between that of iron and lead 
iolenc 
of fire. In the pulverulent state it takes fire even at 100° ©. 
When the slag, from which the metallic globules had been sepa- 
rated, was treated with water, a glistening purple powder was left 
ich : ; “ Sega 
which upon analysis gave cerium 72°20, chlorine 18°38, oxygen 
8°41=98°99 ; giving the formula CeCl4+2CeO. [Or €e,(6,Cl,), 
the dichlorhydrin of di-meta-tri-ceric base].—Ann. Ch. Pharm., 
exliy, 251, Nov. 1867. G. F. B. 
9. Delicate test for alkalies—According to Borrrcer, the color- 
ing matter of the ornamental plant so common in our gardens, 
alled Coleus Verschaffelti, is readily turned green by.alkalies. By 
digesting the fresh leaves in cold absolute alcohol to which a 
few drops of sulphuric acid have been added, for 24 hours, a so- 
. 5 0G 
in natural waters. 
Its sensibility is very great; a piece of the paper held in the flame 
» Pr. Ch., ci, 290, 1867. GF. Be 
10. Method for the direct determination of oxygen in organic 
ance of 6 or 7c. m. from this, another boat containing a weig 
i erenty the tube commu- 
nicates with two gas holders, from which either pure hydrogen or 
pure nitrogen can be supplied at pleasure. The operation is com- 
ss 
applying heat to the copper turnings, to reduce any oxyd present. 
e hydrogen is then completely removed by a current of 
nitrogen, and the ordinary apparatus for the absorption of the 
: combustion is proceeded with 
in the usual way, and when it is finished, the argentic iodate is 
any remain- 
_ gradually heated. The oxygen thus evolved, burns. 
