A BLOWPIPE REAGENT—BOWMAN. 365 
elements to the list of those that can be determined by a dry 
assay. 
I have not specimens of some of the elements whose reactions 
are mentioned by Dr. Haanel, so could not test all his results 
with the dry crystals. The following are some of the results I 
have obtained. Arsenic—The mineral used was orpiment, the 
common sulphide of arsenic. The characteristic reddish orange 
coating comes out very well with both the liquid and the dry 
potassie iodide. Lead. — The chrome yellow coating comes 
out very well with the dry reagents, and also with 
liquid potassic iodide and a drop of hydrochloric acid. 
Tin.—The coating is brownish-yellow, but is difficult to ob- 
tain, and fades rapidly so that a specimen tablet cannot be kept, 
With hydriodic acid the color comes out fairly well, but only 
poorly with potassic iodide solution either alone or with sulphuric 
acid and hardly at all with the dry crystals. Both metallic tin 
and the ore known as stream tin were tried. 
The orange-red coating of Antimony is very easily got. A 
fragment of stibnite, the ordinary sulphide, giving a very decided 
re-action with potassic iodide solution alone or with an acid, and 
also with the dry crystals. Bismuth yields its chocolate-brown 
iodide readily, both with liquid and dry potassic iodide. Gold.— 
This metal gives a faint pink to purple coating, somewhat diffi- 
cult to obtain, but coming out by either method. Molybdenum 
yields an ultramarine oxide coating with the liquid reagents, but 
I have not yet succeeded in producing it satisfactorily with the 
dry. A specimen of Molybdenite was the mineral used. Tung- 
sten yields a faint greenish-blue coating which is an oxide. It is 
easily produced by potassic iodide with hydrochloric acid. Szlver, 
—The iodide coating given by this metal is a canary yellow 
turning to greyish - yellow when cold. It fades away almost 
entirely ultimately. The coating comes out well with potassic 
iodide solution and nitric acid. It is also good with the dry 
reagents. Mercwry yieldsa scarlet and yellow coating, the yellow 
very evanescent and changing to scarlet. The change may be 
hastened by breathing on the coating. The results with potassic 
iodide solution and sulphuric acid are good, also those with the 
