﻿Geology and Natural History. 483 



Occluded gas in vols, 



of the meteorite. C0 2 CO H N 



After 24 hours _ 0*61 54*0 _. 42'4 3*6 



After 6 days more . 2*47 47*0 5-0 47-0 1-0 



After 8 days more... _ 0-63 96-1 2-0 1*5 



A nodule of graphite from the Toluca iron was next examined, 

 and for comparison several terrestrial graphites and one artificial 

 specimen (obtained from the action of oxidizing agents on the 

 cyanogen compounds present in crude caustic soda) were tested 

 in the same manner. A specimen of semi-decomposed gneiss from 

 Canada containing disseminated graphite, and one of feldspar were 

 also taken. The results were as follows : 



Occluded 

 gases in vols. 



Sp. gr. of the graphite. C0 2 CO H CH 4 N 



Celestial graphite, 2*26 7*25 91-81 2-50 5-40 0*1 



Borrowdale " 2*86 2*60 36*40 7*77 22*2 26-11 666 



Siberian " 2-05 2*55 57-41 6-16 10-25 20-83 4-16 



Ceylon " 2*25 0-22 6660 14*80 7*40 3-70 4*50 



Unknown " 1-64 7*26 50-79 3-16 2-50 39-53 3*49 



Artificial " ... 53*13 45'42 39-88 8-31 4-43 2*00 



Gneiss 2-45 5-32 82-38 2-38 13-61 0-47 1-20 



Feldspar 2;59 1*27 94*72 0-81 2-21 0-61 T40 



An examination was also made of the carbonaceous Orgueil 

 meteorite with the following results : 



Occluded 



gases in vols. , Percentage composition. v 



Sp. gr. of the meteorite. C0 2 CO CH 4 N S0 2 



Orgueil meteorite . 2-567 57-87 12*77 1*96 1-50 056 83*00 



Deducting the sulphur dioxide which has been formed from the 

 decomposition of the sulphate of iron, the meteorite is found to 

 yield 9*8 times its volume of gas having the composition : 



C0 2 CO CH 4 N 



76-05 11*67 8-93 3'33 



The organic matter, which is the feature of the meteorite, contains 

 according to Cloez: C 63*45, H 5*98, O 30*57, or corresponding 

 nearly to the composition of terrestrial humus. — JProc. Hoy. Soc, 

 xl, 549. 



2. Recent discovery of Emeralds and Hiddenite in North 

 Carolina; by W. E. Hidden (communicated). — On the second 

 and ninth of last August, two crystal pockets were uncovered at 

 the Emerald and Hiddenite mine in Sharpe's township, Alexander 

 County, North Carolina, that yielded a few very remarkable crys- 

 tals of emerald and of hiddenite. The emerald pocket extended 

 in a nearly vertical direction for twenty feet and was about 

 one foot in diameter and four feet in its extreme lateral extent. 

 The associated minerals were quartz crystals (from one ounce to 

 twenty pounds weight and some that were fluid-bearing), green 

 muscovite (fuchsite?), rutile, dolomite and minute crystals of 

 monazite. The emeralds found were nine in number and as 



