Chemistry and Physics. 473 
the same for iron, cobalt and nickel, the numbers for arsenic, anti-» 
mony an ismuth areas 1:3: 4, those for zinc and cadmium as 2: 3, 
ete; If shaob coeflicients be regarded from the stand point of 
Lothar Meyer’s law of the periodicity of the properties of the ele- 
ments, and be graphically represented as a function of the atomic 
weight, they give a curve similar to that of the atomic volume, in 
which members of natural families have an analogous position. 
Hence the author concludes that the absolute expansion of the 
atom is a periodic function of its atomic weight.— Ber gyorg hem. 
os xi, — April, 1878, . Bs 
‘0 ew Metal, Gallium.—In connection wish Jou 
aaa oc DE BoisBaupRAN, the —— of gallium, has 
worked up the residues obt ained from 4,300 kilograms of the 
Bensberg zine blende, to obtain more e of the hew metal. 
blende was first pulveriaed and varie roasted, the product treated 
te times, the spectroscope ing — to detect the metal, 
In this way, the gallium became concentrated in a residue weigh- 
ing 100 kilograms. ‘This was dissolved in sulphuric acid, purified 
with hydrogen sulphide, and treated with ammonium acetate, the 
25 being continued. ‘The zinc sulphide thus precipitated, carried 
o . . 
ram, Purified ae vd of gal aa a cloth, agitating with 
ee and ak oe tt whe obtained as a hard, 
a latinum wire havi oe a bit of solid eee on ne Pe pers 
shag erystals are obtained, their summits modified by the basal 
planes. Gallium leaves a bluish y mark on paper, is perma- 
gra 
nent in the air, remains brilliant even in boiling water, but 
tarnishes slightly in aerated water. In fusion it is white like tin 
or silver, but becomes blue-green on solidifying. Chlorine attacks 
it readily, evolving inion heat and producing a well crystallized, 
