1882. 131 Tratts. N. V. Ac. Set. 



This has an average thickness of one-half inch, and is thrice intercepted 

 by two inch veins of calc spar, running vertically. 



Heulandiie. Small crystals of this species are said to have been 

 found in some cavities. 



Laumofitite. Some small weathered specimens of this were found 

 in the trap, and it was also noticed quite plentifully in traces. 



Chabayite has been quite rare, a few poorly formed crystals having 

 been found on some of the masses of apophyllite ; also two excellent 

 crystals of a pure yellow tinge, and quite transparent. 



Pyrite. This species is very abundant, profusely scattered through 

 the trap, mostly in masses, but often in excellent crystals drused on the 

 trap. 



Chlorite (?) is quite abundant, in masses and large imitation crystals, 

 weighing five or six pounds ; most of it occurs in a vein about six feet 

 wide, within a few feet east of the pyrite locality. It is of a very dark 

 color, quite impure and brittle, and was mistaken for coal by some par- 

 ties visiting this shaft, who spread the report that a bed of coal eight 

 feet wide h-^d been discovered. 



In closing, Mr. Darton expressed his belief that much more fine 

 material would still be found in excavating the space between shafts 

 numbers one and two. 



The paper was illustrated with sections of the tunnel, and by many 

 choice specimens of the minerals described. 



DISCUSSION. 



Mr. Chamberlin, Mr. G. F. Kunz, and Prof. D. S. Martin, 

 made remarks on the paper, expressing much interest in the va- 

 riety and beauty of the minerals found in this tunnel, and making 

 comparisons with the modes of occurrence of like species in the 

 other Bergen tunnels. 



Mr. Wm. Earl Hidden, then read the following paper : — 

 a phenomenal find of fluid-bearing quartz crystals. 



In a paper read before this Academy in January last, on the emer- 

 alds from Alexander County, North Carolina, mention was made of 

 certain remarkable crystals of quartz found associated with them. 



These quartz crystals having shown various peculiarities rarely ob- 

 served, I have thought the recounting of these phenomena would per- 

 haps be of interest. 



Crystals of quartz containing inclusions of fluids and gases are not 

 uncommon, though crystals having such inclusions plainly visible to the 

 naked eye are rarely found. 



The quartz crystals from Western North Carolina have attained n 



