J. L. Smith on the Emery mine of Chester, Mass. 83 
is Ireland on the 12th, and in Rochefort, France, on the 13th of 
ay. ; 
On the 16th, Mr. Huggins — ee Miller made a eareful 
observation of its spectrum,—the star being then a little below 
the 4th magnitude. Their BE si was that the spectrum was 
double, cousisting of one principal system of lines analogous to 
that of the sun; and, superposed upon this, a second one, ap- 
parently due to light emanating from intensely heated gaseous 
matter ,—containing, among other bands, two bright ones in the 
positions of the lines F and C, which correspond to hydrogen 
ines 
r. Courbebaisse, who observed the star at Rochefort on the 
13th, states that he had seen no such star there on the 11t 
Art. XIV.—On the Emery — of —— ip Aa County, 
Mass., with remarks on the nature of H and tts associate 
minerals; by J. LAWRENCE oe Pres’ t ase Gas Co. 
CONSIDERABLE interest is attached to the recent developments 
of an extensive deposit of emery in Chester, Hampden county, 
Mass., by Prof. C. T. Jackson; and my name has been associate 
in various ways with it, without my having had any thing directly 
to do with it. Sundry communications have also been received 
by me from various aries These communications are best 
auswered by the faets embraced in this article, some portions of 
which it has always been my eiempe: . publish without ref- 
erence to the special interest of any one in the matter. 
ae to 1846, awe was simply ee as a mineral, coming 
us from a few rem te localities, and was used in the arts with- 
= our having any Cee of its true geological position or 
its mineralogical relations. “About that period, circumstances 
favored my commencing those geological and mineralogical dis- 
coveries in relation to emery, that were afterwards embodied in 
two papers, presented to the Academy of Sciences of Paris, in 
1850, in which the subject was thoroughly discussed, and I might 
say almost exhausted. The light in which those discoveries 
were considered will be seen by ‘the conclusions of the report of 
the committee of the Academy, salad of Messrs. Dufrenoy, 
Elie de Beaumont, and Cordier, v 
“Tt results from the review ut given of the labors of Dr. 
Smith, ie he has,made known— 
. recise nature of the geology of emery in Asia Minor 
and the a Archipelago ;” 
2d. “That he has deseribed the properties of the principal 
minerals associated with it, and the manner in which they occur, 
