cence eniter i ges 
titi oeaniin'ases ane taint 
Miscellaneous Localities of Minerals. 247 
wards the angle formed by this side, and one side of the ter~ 
minating pyramid. What adds to the interest of the speci- 
men is, that by carefully inclining the crystal, so as to’ make 
the enclosed bubble of air approach the angle, the property 
of double refraction is distinctly seen, and we have | t- 
ed to us two bubbles instead of one. By an attentive ex- 
amination of specimens in my possession, I had the good for- 
tune to find several pieces, most of which contain one ea 
and several three globules. Mr. Mason has since fouinh 
other similar specimens among those belonging to the 
above named society, and among some in his own collection. 
One of these has an undulating motion, rising in about the 
centre of the cavity, so as to form a curve, and again de- 
scending on the other side ; mPa in its movement, that 
of a boat over a wave. One in my possession, instead of 
line 5 backwards anid forwaede; will, when the crystal is 
kept revolving, describe a igo 3 two others per- 
form circuitous Courses ; in one crystal there are two cavi- 
ties parallel to each other, containing globules that move 
simultaneously in the same direction. With but one excep- 
tion, none of the cavities hitherto noticed, are str. 
which renders it necessary to change a little the position of 
the crystal, in order to facilitate the passage of the liquid. 
Most of these specimens have been found among such as 
were rejected on account of being too pale for good cabinet- 
specimens, which will therefore enhance the value of many, 
that have heretofore been considered as uninteresting. 
Some of these present erey appearance of containing glo- 
bules ; but they are not moveable, in any position of the 
specimen. One of these spout globules, is so situated 
as to exhibit the refractive power of the amethyst, equally 
well as the one first noticed. 
Crystals of quartz, reek —_ globules, are ocea- 
sionally found at Cape Diamond, near Quebec, which locali- 
ty | believe has never yet been pisticoniae 
It is probable that such specimens occur more Be psthy 
than is generally supposed, and our ignorance of their exist- 
ence ais be fairly imputed, in part at least, to our not ex- 
amining specimens from different localities, with that cau- 
tion itch we should ; for many of them are so placed, that 
