lieve it, this fact corroborates the idea that the nervous system 
characterizes only the primary divisions. And our position would 
Cambridge, Mass., October, 1850, 
Arr. V.—Memoir on Emery; by J. Lawrence Surru, M.D.— 
Second part.—On the Minerals associated with Emery: Co- 
rundum, Hydrargillite, Diaspore, Zine spinel, Pholerite, E'ph- 
esite (a new species), E’merylite (a new species), Muscovite, 
Chloritoid (a new variety ), Black Tourmaline, Chlorite, Mag- 
| netic Oxyd of Iron, Oligiste Iron, Hydrated Oryd of Iron, Iron 
g Pyrites, Rutile, Ilmenite and Titaniferous Iron. 
completely the mind. 
: 
Read before the Academy of Sciences of the French Institute, July 15th, 1850, and 
: communic i al. 
ated by the author for this Journ 
Now that it has been shown that emery is found in considerable 
abundance in certain parts of the world,* occupying almost the 
position of a rock ; it is useful to mention the different accidental 
minerals or minerals of elimination, that are found with emery, 
and what new facts have been observed with relation to them. 
Corundum may be first mentioned. 
Corundum.—Although emery is constituted principally of co- 
rundum, the examination of this substance in its pure state, or 
tather in the form of those prismatic crystals which I have some- 
times found in contact with emery, has brought to light several 
new aud well established facts that could not have been satisfac- 
torily ascertained from a mixed mineral like emery. 
€xcept that of Kulah and of Adula, which is of a greenish grey. 
All that I have to add to what is already known of this mineral, 
RE Sap eae ee 
Pos For the First Part of this memoir, see the last volume of this Journal, pages 
5804, 
J. Lawrence Smith on Emery. - » ee, 
+ See the jirst part of this memoir for a description of the localities, this Journal, 
