106 
FIELD COLUMBIAN MusEuM —GEOoLoGy, VoL. III. 
ANALYSES OF OCCLUDED GASES. 
The occluded gases of nine iron meteorites have been determined. 
These are here shown. 


Name. Vols. H. 
Charlotte: 4.35% 2.20} 71.40 
Cranbourne ....] 3.59} 45.79 
Prenarto ea: 2.85] 85.68 
Magura: .6 .).': 47.13} 18.19 
Red River. ..:. 1.29] 76.79 
Rowton .....;. 6.38). 77.78 
Shingle Springs} 0.97] 68.81 
Staunton 4.25.. 3-17| 35.83 
Tazewell: 32.5 3.17] 42.66 
COar{ CO: 


13.30]15.30 
0.12/31 .88 
12.56167.71 

8.59|14.62 
5-15) 7.34 
13.64/12.47 
9-75/38.33 
14.40]41.23 




N. | CHa Analyst. 
Sais Ratio A. W. Wright. 
17.66] 4.55|W. Flight ..... 
D Bolan Th. Graham ... 
EeGAlexs oe A. W. Wright.. 
eee lees A. W. Wright.. 
G72]... 7.|We Elightacaeee 
alba) & expe A. W. Wright... 
16.09].<... JW. Mallet... 
Ie 7A ese A. W. Wright.. 
Reference. 
11876, A. J.S. (3), XI, 257 
1882, Ph. Tr. Roy. Soc. Lor 
don, 893 896 
1866, Proc. Roy. Soc., Lor 
don, XV, 502-503 
1876, of. cit. 
1876, of. cit. 
1882, of. c7t. 
1876, of. cit. 
1871, Proc. Roy. Soc. Londo: 
XX, 365-370 
1876, op. cil. 

DISCUSSION OF ANALYSES. 
The most striking feature brought out by the analyses is the rela- 
tion shown between chemical composition and structure. 
to be definite and general. 
Coarsest Octahedrites- - - - 
Cl 
Hexahedrites 
Coarse 
Medium 
Fine 
Finest 
ass. 
ee 
This seems 
All the meteorites of a hexahedral struc- 
ture have a nearly uniform composition, while among the octahedral 
meteorites, fineness of structure increases with increase of nickel. 
This conclusion can best be shown by obtaining the averages from the 
analyses of the different groups, omitting all obviously faulty analyses. 
The results thus obtained are as follows: 
No. of Width of Per Cent 
Analyses. . reese: Fe. 
in Millimeters. 
20. See a ee 94.12 
re + 2.5 93.18 
oat 22 2.0-1.5 92.28 
aPe oe 88 I,0—-0. 5 90.64 
: AI 0.4—-0..2 90.18 
re Map 13 oO. 2— — 88.51 
It is worthy of note that these averages are not means between 
wide limits, but are derived from nearly uniform values. 
Practically 
