186 N.S. Manross on the Artificial Formation of Minerals. 
declares that, in a mineral system, the sole question for considera- 
ion is the elem nts and their inorganic combinations, and that it 
is these which sali be systematically arranged. But he himself 
directs ro to the difficulties which this view necessarily i in- 
vol it, he asks, admissible to make one species of diamon 
ae siesgaties, or of rutile, brookite, and anatase, or of calcareous 
spar and arragonite? It is scarcely to be yi rae that mineral- 
ogists will give their consent to such a cours 
However, Berzelius decides in the dirasrite Still la 
opinion that there are even many chemists who will not aa 
tionally agree with him in this.  F'or it is not alone from the con- 
stituents that all the characteristic properties of the compound 
result, but also from the mode and action of their combination, 
which is frequently indicated by the form. Taking all this into 
ee a wit a Ras probable that dolomite is more closely re 
lated to caleareot s spar than arragonite, and even that tinstone 1s 
nearer te rutile iia anatase and “Broo kite. 
Since the external characters of minerals are determined, a8 
well by their constitueuts as by the mode in which these are com- 
bined with each other, it follows that that chemical system 0 
mineralogy which approaches most closely to the natural sys 
tems, or which even corresponds with them, must be the mos 
perfect. 
{To be continued.) 
‘Arr. XX.—Artificial Formation of Minerals; by N. &. 
Manross. 
HIS Memoir—an inaugural dissertation by Mr. Manross 0B 
[Tv 
his promotion to the rank of Doctor of Philosophy at the Geor- 
meenione hela (32 pp., Svo, Gottingen, 1852)-conlam 
ount of the ag formation of several minerals. thee 
peri sito were made in the Laboratory of Prof. Wohler. 
cite briefly the Sosa ‘followed by Dr. Manross and his: i 
Heavy Spar (Ba8) was obtained by fusing together twelve 
grammes of neutral sulphate of potash and 52 grammes of ane 
hydrous chlorid of barium in a thin porcelain crucible, this being 
enclosed in a Hessian crucible which was well luted. After a! 
hour, on treating the cooled mass with water, an abunda dance of 
minute crystals were left behind Ls at had the form of heavy 
spar, giving M:M=101° 43’. Some of them were two milli- 
cababge bit and one thick. AAT Vis afforded § 34:32, Ba 65° 57, 
9: 
al (Sr 8) was formed by on together i fi of pot- 
ash wi a excess of chlorid of strontium. On breaking ope? 
the cooled mass many transparent ie als were phat y 
were amas as before by dissolving the excess of chlorid in 
Mss | 
