234 Miscellaneous Notices in Mineralogy, Geology, §e. 
some quartz crystals (among other minerals which we may 
notice on a future occasion) from Dr. Porter of Plainfield, 
Mass. which for their perfect transparency equal any thing, 
of the kind, that we have ever seen; they do not exceed one 
fourth or one third of an inch in diameter, and the largest 
that has been obtained is only three fourths. 
8. Agaric Mineral. 
_ Professor Hall in a letter to the editor, states, that a sub- 
stance found in Vermont, and there called chalk, effervesces 
ance, as he intimates, of a disintegrated carbonat of lime, 
whose minutely divided parts have been feebly reagglutina- 
ted. so strongly resembles agaric mineral that we have 
ventured to give itthat name. 
Oe 
9. Marbles of Kentucky. 
Being from a secondary country, their structure is wholly 
, and they are, most remarkably different from the 
highly erystalized marbles of the primitive countries. 
10. Fetid Crystalized~ Limestone. 
We formerly mentioned a’ fetid crystalized limestone 
= 
