52 
sylvania and concerning which and its use in the direct 
manufacture of steel much had been published in the public 
prints. This ore is being worked very extensively in fur- 
nacesat York, Pa., and apparently successfully. It looks: like 
Mica-schist with dark, evidently crystaline granules dissemi- 
nated throughout the mass. Where it is mined it is reported 
to occur in the form of hills of two to three hundred feet in 
height and readily accessible. When analyzed it is found to 
contain about forty per cent. of Magnetic Oxide of Iron with 
ten per cent. of the Peroxide. Ordinarily to convert it into 
steel, Cast Iron in certain proportions is mixed with it, and 
in this way it would appear that some of the oxygen of 
the ore is used to burn off a portion of the carbon present in 
the Cast Iron and leave sufficient to render the resulting 
compound still of good quality. 
Dr. WALz remarked that he had examined three analyses 
of the Codorus ore made by separate chemists and they 
agreed very closely, showing it to be remarkably free from 
both Phosphorous and Sulphur, which substances the metal- 
urgist finds it at present impossible to remove economically 
from Iron ores; hence many ores which occur in abundance 
are useless for the manufacture of steel; those two substan- 
ces being extremely deleterious. The Codorus ore contains, 
however, Chromium. 
Pror. H. Morton exhibited two Photographs upon Glass of 
Sun Prominences, taken by Prof. C. A. Young, of Dartmouth 
College, Hanover, N. H., by means of the spectroscope ; the 
first time that this remarkable feat has been accomplished. 
He also exhibited photographs of the instrument employed 
by Prof. Young. It consists of a spectroscope attached to 
the Equatorial telescope, and furnished with a battery of six 
prisms and a half prism. That is to say, after the ray of 
light proceeding from the sun’s prominence, passes through 
the six prisms of the instrument, and then the half prism at 
the end, it is caught by a right-angled reflecting prism, thrown 
back, and made to traverse again the half prism, and six fol- 
