268 Scientific Intelligence. 
chlorid. The spoon is then to be cooled under naphtha and the metal 
scraped off with a penknife. As these operations may be repeated 
every three minutes, an ounce of chlorid of lithium may be reduced ina 
short time. Lithium is a white metal having the color of silver, buta 
freshly cut surface presently becomes yellowish from oxydation. Fused 
at 180° and quickly pressed up between two glass surfaces, lithium gives 
a mirror which perfectly resembles polished silver in color and lustre: 
its streak upon the touchstone is gray while that of calcium, barium, or 
tium, with a violent evolution of gas; concentrated. sulphuric acid has 
however very little action in the eclé. Silica, glass} and porcelain, are 
reduced by lithium under 200° C., but by calcium and strontium only at 
a red heat. The density of metallic calcium prepared from the pure 
chlorid, was found to be 1:5778 as a mean of three experiments: the 
corresponding atomic volume is 158. The density of strontium as pre- 
pared from the pure chlorid and hammered out was found to be 2°5416 
which corresponds to an atomic volume of 216. The author’s former 
. The dependance of the reducing power of the galvanic current 
upon its density, to which Bunsen first directed attention, has been Very 
tly shewn in the present investigation. The best arrangement 's 
| Gonsists of 
imilar to that formerly described, and porcelain cru- 
