nt in the reduction of these metals. Carbonate of soda
is very efficient for the detection of minute quantities of manganese.
The mixture of the carbonate of soda with a small addition of nitrate
of potassa, and the mineral containing manganese, must be fused on
platinum foil. The fused mass, when cooled, presents a fine blue
color.

* * * * *

1. The following minerals, according to Griffin, produce beads with
soda, but do not fuse when heated alone: quartz, agalmatolyte,
dioptase, hisingerite, sideroschilosite, leucite, rutile,
pyrophyllite, wolckonskoite.

2. The following minerals produce only slags with soda: allophane,
cymophane, polymignite, aeschynite, oerstedtite, titaniferous iron,
tantalite, oxides of iron, yttro-tantalite, oxides of manganese,
peroxide of tin (is reduced), hydrate of alumina, hydrate of magnesia,
spinel, gahnite, worthite, carbonate of zinc, pechuran, zircon,
thorite, andalusite, staurolite, gehlenite, chlorite spar, chrome
ochre, uwarowite, chromate of iron, carbonates of the earths,
carbonates of the metallic oxides, basic phosphate of yttria, do. of
alumina, do. of lime, persulphate of iron, sulphate of alumina,
aluminite, alumstone, fluoride of cerium, yttrocerite, topaz,
corundum, pleonaste, chondrodite.

3. The following minerals produce beads with a small quantity of soda,
but produce slags if too much soda is added: phenakite, pierosmine,
olivine, cerite, cyanite, talc, gadolinite, lithium-tourmaline.

* * * * *

1. The following minerals, when fused alone, produce beads. Of these
minerals the following produce beads with soda: the zeolites,
spodumene, soda-spodumene, labrador, scapolite, sodalite (Greenland),
elaeolite, mica from primitive lime-stone, black talc, acmite,
krokidolite, lievrite, cronstedtite, garnet, cerine, helvine,
gadolinite, boracic acid, hydroboracite, tincal, boracite, datholite,
botryolite, axinite, lapis lazuli, eudialyte, pyrosmalite, cryolite.

2. The following minerals produce beads with a small quantity of soda,
but if too much is added they produce slags: okenite, pectolite, red
silicate of manganese, black hydro-silicate of manganese, idocrase,
manganesian garnets, orthite, pyrorthite, sordawalite, sodalite,
fluorspar.

3. The following minerals produce a slag with soda: brevicite,
amphodelite, chlorite, fahlunite, pyrope, soap-stone (Cornish) red
dichroite, pyrargillite, black pota