1822.) Scientific Intelligence. 75 
~ The second analysis, that by potash, which appeared to M. Laugier 
to be the most correct, gave the following results : 
Bi CRYS FAP OIE: B gO TOL ASE RA 
Oxide vf iron! 22525) 29. BLE) 24 gar 
Oxide of Manganese ........... 6°5 
+ Ain? POS 5 CNS SB oO 
Kime «2 205: aS ERS Te 
Chrome) 2). Js Pp Rees Oe ele ae 
VEGA Sice FY Aine ak 3.0 oe - = < pie En 
RUM. Stance cite ea. ee 
NPOSHEINE vo notice Bie tee ialatins cates ee 
UGE) W's Cattle Soles vs ate ck’, S daaue 
Indispensable loss...........-..  3°0 
Loss from unknown causes...... 48 
100-0 
M. Laugier observes, that the loss of four or five per cent. which 
always occurred in his analyses, instead of the increase which, in 
these kinds of analyses, usually results from metals which the 
aerolites contain, renders it probable that in the aerolite of Juvinas, 
the iron and manganese exist in the state of oxides. No portion of 
this aerolite reduced to powder was attracted by the magnet, which 
renders this conjecture more probable. 
M. Laugier endeavoured to discover whether this loss was owing to 
carbonic acid, but the stone did not appear to contain any: in a sub- 
sequent analysis he found, however, that it yielded rather more sul- 
phur than stated in the analysis. He afterwards observes that this 
areolite resembles one which fell at Ionzac in its analysis, and espe= 
cially in the absence of nickel; and also with an aerolite which fell 
in 181%, in the environs of Lantola, a village in the government of 
Wibourg, in Finland. ‘These are the only areolites which have been 
hitherto found destitute of nickel. 
V. Magnesian Minerals of Hoboken. 
It appears from the observation of Mr. Nuttall, that magnesian 
earth pervades not only the mass. of serpentine rock, which occurs at 
Hoboken, in New Jersey, but. all the concomitant minerals, in a 
manner hitherto unexampled. Among the latter is the hydrate of 
magnesia, which contains 30 per cent. of water, * and a minute pro- 
portion of iron, the latter ingredient being found even in the purest 
specimens which are . perfectly colourless and diaphanous. Con- 
tiguous to this is found a species of magnesian marble, forming a con- 
tinuation of the same veins which afford the magnesian hydrate. It 
contains in 100 parts 4% magnesia, 50 carbonic acid, and variable 
proportions of lime, silica, and protoxide of iron. 
_In veins of the same rock a mineral occurs, which, from its silky 
lustre, and flexible fibrous texture, was at first.mistaken for amianthus. 
It was found, however, to dissolve entirely without effervescence in 
* This, as well as the similar mineral found in Shetland, by Dr, Hibbert, appears to 
be the proto-hydrate, consisting of one atom of magnesia, = 18°5 + 1 atom of water 
= 85. : 
