Intelligence and Miscellaneous Articles. 159 
experiment. Until they do so, they have no right to talk of ‘the 
memoir in which Riess refuted my statement,’ &c. (Phil. Mag. 
1854, vol. vii. p. 297). 
I remain, Gentlemen, 
Windsor Villas, Plymouth, Your obedient Servant, 
July 16, 1857. W.S. Hargis. 
ON THE COMPOSITION OF BEUDANTITE. BY M. RAMMELSBERG. 
The author obtained Beudantite from Cork from Dr. Krantz; it 
formed small, green octahedra, partially covered with a rust-coloured 
coating, which, like those from Horrhausen, were seated upon a 
brownish-black, racemose brown hematite, or rather iron-sinter. 
When heated in the air, Beudantite furnishes an acid liquid, but 
nothing else of a volatile nature, and becomes red. It is infusible 
before the blowpipe, but diffuses an odour of sulphurous acid, and 
deposits a yellow coating on charcoal; with fluxes it gives the reac- 
tion of iron and some copper; when reduced with soda it furnishes 
a black slag, a yellow coating, and granules of lead, together with 
spangles of iron. 
If the powder be boiled with water, nothing is dissolved, and espe- 
cially no sulphuric acid is extracted. Nitric acid behaves in the 
same way. Muriatic acid attacks the powder slowly when boiled; 
the reddish-yellow solution contains sulphuric acid and oxide of lead, 
and deposits chloride of lead on cooling. 
Boiling solution of potash colours the powder brownish-red, but 
dissolves no oxide of lead; it dissolves phosphoric acid, however, as 
is proved by its behaviour with silver salts, salts of magnesia, and 
molybdate of ammonia. 
The specific gravity of the purest fragments was = 4°295. The 
results of various experiments are,— 
if Il. Il. IV. 
Sulphuric acid.... 12°40 12°32 13°55 13°96 
Phosphoric acid ..__... 8:00 9°73 8°21 
Arsenic acid...... ie 0:21 0°37 0°10 
Oxide of lead .... ¥t 20°35 22°98 07°59 
Oxide of copper... a 2°45 
Oxide of iron .:., <i 38°11 40°42 40°96 
Ey a a 9°77 ee i (9°30) 
100-00 
The average of III. and IV. is,— Oxygen, 
Sulphuric acid ........ 13°76 ae 8:26 
Phosphoric acid........ 8°97 5°02 5-10 
Arsenic acid .......... 0°24 oer ° 
Oxide of lead ........ 24°05 1°72 9-9] 
Oxide of copper ...... 2°45 0°49 
Oxide of iron .,...... 40°69 ii 12°21 
nn ena 9°77 8°68 
99°93 
One of the analyses previously made by Dr. Percy* nearly ap- 
proaches those of the author, except that the arsenic acid prepon- 
* Phil. Mag. for September 1850. 
