Chemistry. 275 
help, it was ef to be mistaken; and that Mr. Lamy has on rece" of great 
sagacity, when e places, without hesitation, a metal so mu h resembling lead 
in its essential ee beside the alkali metals, et St and sodium, 
which it resembles so lit 
Thallium is a perfect metal endowed in the highest degree with a metallic 
— as is seen on examining a freshly- aie surface, or on heating a bar 
n hydrogen, suas aise ing it to coo n that oF was. It is less blue than 
lexé, lit white than silver, and, in its ee aan resembles tin or ‘innabenk 
than any other metal. It softens at 100° — nd, if — for some time at that 
> a ac aap a crystalline structure beco apparent in the ingot: this is 
shown by the appearance of a beautiful watiene (mois) Phage when the 
metal j is moistened with water, which cleanses the surface like 
efore the blowpipe, thallium exhibits some characteristic vioacinaelt It 
melts rapidly, and oxydizes, giving off odorles ater A ab a whitish —" but 
mixed with reddish or — tones. Jt continues to the fumes a long 
time after the setting. os eas sed. alae principal globule = cooled . 
a ve bule of the metal is placed on a cupel ore ted to. redne s, and then 
strongly sltaling b base, d potash ; and the peroxyd, which gives up 
oxygen when heated vith feces acids, and may be converted into a chlorid, 
which, when heated, gives up a part of its chlorine. Chem ae will 
having, like potash, a great affini sedi for water, loses its water fealty when 
ted, or even when cold in a vacuum. ere then remains ee _— 
anhydrous oxyd while the hydrated ouye | is yellowish white : the oxyd is hy- 
drated or de ehydrated with equal facility. It will be further oeten § that the 
Peroxyd of Salon, | in the os aa of Mr. Lamy, has given no sign of the 
formation of o oxygenated w 
Thallium burns in dry chortle: It forms three chlorids, one of which cor- 
| resemble 
the Corresponding compounds of lead as of patty is scluble; but a 
The sulphid of thallium aualied by precipieation z te browriieh black ; it re- 
ier of lead. Jn whatever way obtained, it ~ oxydizes in the 
r “ee is conve t soluble and etna ulp : eee? 
allium is very slowly attacked by h lorie aci even 
tated and ae It hg on the contrary, rapidly attacked by nitric ban sul- 
Phuric acids, Th er, concentrated dissolves it with a rapidity 
Which contrasts with the slowness with which the same acid attac 
