154 
January 30, 1871. 
Pror. T. E@ueston, Vice President, in the chair. Twen- 
ty persons present. 
Dr. L. FEUCHTWANGER exhibited a specimen of Crystal- 
lyzed Quartz, which was notable as it had apparently formerly 
contained within its mass crystals of Arkansite; but that 
mineral has been removed so as to leave cavities which show 
the outline of the Arkansite crystals. 
Pror. T. EGLESTON said that specimens of this character 
were of some interest, but, as he had examined several simi- 
lar specimens which were supposed to be Quartz crystals 
penetrated by delicate prisms of Titanium minerals he had 
found that no such mineral was present; merely cavities 
more or less colored. 
Pror. D. S. MarTIN mentioned the fact that in Rhode Is- 
land Quartz crystals were frequently found penetrated by 
Actinolite. © 
Pror. C. A. SEELY exhibited a specimen of a material 
having the appearance of a Light-colored Clay. As, however, 
it took a polish on being rubbed with a hard object, he con- 
sidered that it could not be clay but was probably something 
new. It came from Rhode Island and he had made a chemi- 
cal examination of it and found it to consist of Magnesia 2°8, 
Silica 28:0, Alumina 70:0. Therefore he considered it to be 
essentially a Silicate of Magnesia and Alumina. It occurs 
as a large bed and is of commercial importance. This speci- 
men, as well as that exhibited by Dr. Feuchtwanger, was re- 
ferred to Prof. Egleston for examination and report. 
Mr. S. SmirH exhibited a very large Coleopterous Insect, 
from Kentucky, where it, as well as one more, was obtained 
on splitting open a log, within which it doubtless had been 
hatched and passed through its larval condition. 
