J. P. Kimball—Grahamite in the Huasteca, Mexico. 277 
Art. XXXV.—On the occurrence of Grahamite in the Huasteca, 
Mexico, and Notice of the Geology of that Region; by JAMES 
P. KimBauu, Lehigh University, Bethlehem, Pa. 
that neither variety isa true mineral species, any more than 
other native hydrocarbon compounds, like petroleum, asphal- 
tum, or mineral coals. The following observations serve to 
contirm the received theory of the nature and origin of albertite 
and grahamite, and to demonstrate that these bodies are 
‘ssentially mineralized or fossilized asphaltums, derived from 
asphaltic petroleum, ittasphalt or maltha, by the loss of 
iydrogen and the addition of oxygen. In the degree of this 
_. to such anthracitic bodies, low in oxygen, as are 
N found in cavities of the rock in the older formations. 
Sine ous Springs of asphaltic maltha, forming in places 
kta deposits of solid asphaltum, occur on the eastern 
Pe of the Cordilleras of Mexico, or rather, in the littoral zone 
* This Jo: * : 
PTS Bears vi, IT, 1873, 108. Thid., xii, TH, 1866, 420. 
vm. Sct. Taump Sentes—Vor. XII, No. 70.—Ocr., 1876. 
