A BLOWPIPE REAGENT—BOWMAN, 367 
which require nitrate of cobalt. The test for alumina is hardly 
distinctive as a fusible silicate gives the same reaction; so that 
magnesia is the only one really omitted. The seven metals 
added by this method are tin, bismuth, gold, thallium, molyb- 
denum, tungsten, and cadmium. Dry assay by either ordinary 
blowpipe methods or with this new iodide process will determine 
practically all ores of useful metals. One advantage of this new 
method is that sample tablets can be prepared and kept for com- 
parison with results obtained from unknown specimens, as many 
of the colors are quite permanent. I have also tried barium 
nitrate with the dry potassic ivdide, but it deflagrates too 
violently. I hope to be able to carry out some more extended 
experiments in this line and to communicate the results to this 
Institute if they are considered sufficiently valuable. In a later 
trial with tin and tin ore I believe I have succeeded in bringing 
out the proper reaction. As the color is somewhat the same as 
that of iodine alone on the tablet, I wish to compare my results 
with Dr. Haanel’s before saying definitely that I have succeeded. 
Time did not permit of my doing this before reading this paper 
