tion of the metal. The method consists in making the iron to be an- 
alyzed the positive electrode in dilute chlorhydric acid, when the iron dis- 
cast-iron and steel without the previous difficult and laborious pulveriza- 
a 
Mine, itis onl necessary to regulate the strength of the current by ad- 
Justing the distance of the electrodes from each other, so that only proto- 
chlorid of iron is formed ; the formation of the sesquichlorid is indicated 
by the yellow color of the solution. A single Bunsen’s element is suffi- 
c a 
Platinum and the iron cannot be moistened by the se se The separated 
number 
lyses conducted according to this method gave results which closely 
corresponded and which were usually a little higher than those obtained 
by the ordinary methods. With respect to the time required, the author 
tetharks that a piece of cast-iron weighing about eight grammes, is dis- 
Solved in twenty-four hours.—Pogg. Ann., exiv, 507. W. G. 
. 8: On the peroxyds of Potassium and Sodium.—Harcovrt has stud- 
led the action of dry air and oxygen upon metallic potassium and sodium. 
action of dry air upon potassium appears to consist of at least two 
carefully regulating the heat and the supply of air, nearly 
the potassium may be converted into a white oxyd. The 
acl ooh of oxygen absorbed in this ee is re . oo ~ 
dati i oceeds farther, but the white oxyd appears to 
xyd. he eens oh or peabaies yellow, and 
to see why the formula should not be 
though re unable : 
erie der with effervescence and formation 
ecomposes the pow 
yd, the equation being 
