30 ROCHESTER ACADEMY OF SCIENCE. fy amesuey 
small twin crystals having a form similar to those of the Tyrolese alps ; 
I was quite sure from the physical character that this was titanite, and 
Mr. J. M. Davison has kindly proven their character by chemical test in 
the University Labratory. Although Magnetic Cove has long been 
noted for its various forms of oxides of titanium, this is the first 
instance to my knowledge that a silicate of titanium has been found at 
this locallty. 
In the first box received there were several small and much 
weathered crystals of idocrase or vesuvianite, and in the second lot 
there were specimens of this mineral in crystals and fragmentary 
crystals measuring from 9 to 13% centimeters in their greatest diameter, 
which are of unusual size for vesuvianite. Another interesting feature 
of these crystals is the fact that in most of them the prisms terminate in 
a pyramid or zirconoid, instead of terminating in the basal plane as 1s 
the usual case. All of these crystals were doubly terminated. 
There were also a number of specimens of tremolite more or less 
associated with a gangue rock. Among the tremolite was one small 
crystal with a perfect termination of a delicate yellowish tint, almost 
transparent, which is rather unusuak for tremolite, as distinct crystals 
are seldom found from any locality. 
There were also a few specimens showing blotches of what at first 
sight seemed to be a red variety of tourmaline, but proved to be 
eudialyte. These blotches measured from 4 to 28 millimeters in 
diameter, and among them two specimens showing crystals measuring 
g and 10 millimeters in length, the latter showing both terminations of 
the crystal. These crystals were, however, of poor color. 
There were numerous specimens of pyroxene in form like the 
fassaite crystals from the Fassa Valley, the first that I have seen, and 
also a few specimens showing small, slender crystals of the black variety 
of tourmaline. 
The previously assigned topic for discussion, atmospheric agencies, 
was there taken up, during which discussion Mr. Howell exhibited 
specimens of marble from the Colorado cafon, showing the effect of 
erosion, one by the sand blast, the other by water. 
Fossils and minerals from the Black Hills were presented by Mr. 
McNeal for identification. 
December 2, 1889. The Sectional Committee were elected. 
Two specimens of dolomite from the west side of the Genesee 
river, north of the rapids, were presented by Mr. Walker. An unusually 
large bezoar from a horse, six inches in diameter, was exhibited by Mr. 
