METEORITES OF NORTH AMERICA. 297 



Brezina 3 described the structure as follows: 



Finely granular; kamacite somewhat puffy; polyhedral troilite grains or plates in the kamacite. .Breadth of 

 bands, 0.8 mm. 



Meunier 4 gave the following description: 



Has the structure and composition of the caillite type, but with less geometrical regularity in the etching figures. 

 At certain points the tenite laminae are very close together, elsewhere they are relatively distant; the kamacite bands 

 are quite large and plessite is remarkably scarce. 



Cohen 5 noted that the iron took on a more or less permanent magnetism. 

 The meteorite is distributed, Amherst having the largest mass (6 pounds). 



BIB1IOGRAPHY. 



1. 1860: Smith. Description of three new meteoric irons from Nelson County, Kentucky, Marshall County, Ken- 



tucky, and Madison County, North Carolina. Amer. Journ. Sci., 2d ser., vol. 30, p. 240. (Analysis.) 



2. 1862-1865: Von Rbichenbach. No. 21, p. 589; and No. 25, p. 437. 



3. 1885: Brezina. Wiener Sammlung, pp. 213, 214, and 234. 



4. 1893: Meunier. Revision des fers meteoriques, pp. 52 and 56. 



5. 1895: Cohen. Meteoreisen-Studien IV. Ann. K. K. Naturhist. Hofmus. Wien, Bd. 10, pp. S2 and 86. 



Marshall County, 1893. See Plymouth. 



MART. 



McLennan County, Texas. 

 Latitude 31° 31' N., longitude 96° 45' W. 

 Iron. Fine octahedrite (Of) of Brezina. 

 Found 1898. 



Weight, 7,144 grams (15.75 pounds). 



This meteorite was described by Merrill ', as follows: 



The second meteorite to be described, which will be known as the Mart Iron, was found early in 1898, on the farm 

 of H. T. Vaughan, near Mart, in McLennan County, Texas. 



This iron weighed originally 15.75 pounds. From it a slice weighing 456 grams was cut for the collection of the 

 National Museum, the iron having been donated by the finder to the museum of Baylor University, at Waco, Texas. 

 For the privilege of removing this slice we are indebted to Mr. O. C. Charlton, curator of the museum. The original 

 shape of the iron was that of an irregular oval, somewhat flattened at one side and rounded above, with two large and deep 

 pittings on the broader surface. The original dimensions were about 8.5 X 15 X 25.5 cm. It was not seen to fall and 

 had evidently lain in the soil some time, as the exterior was considerably oxidized and the troilite, which presumably 

 once occupied the pits, was completely eliminated. Small dark points on the etched surface are due to troilite. Sundry 

 cracks in the iron at various points on the etched surface are also filled with troilite which frequently oxidizes in process 

 of etching. Mr. Tassin, by whom the etching was done, calls attention to the perfection of the Widmannstatten figures, 

 and particularly to the relief of the taenite bands. 



As shown by this etching, the iron belongs to the octahedral variety, and is of moderately coarse crystallization. 

 Its general appearance is so similar to that of the Hamilton County (Texas) iron described by Howell as to suggest that 

 it may be a part of the same fall. The probability is still more evident when it is considered that the two localities are 

 not over 50 miles apart in a straight line. 



The chemical evidence, as shown by a comparison of Mr. Eakins's analysis of the Hamilton iron with that of Doctor 



Stokes, is, however, not favorable to this view, though we believe the possible (if not probable) variation in composition 



in different parts of the same iron has not yet been fully worked out. 



Mart. Hamilton Co. 



Fe 89.68 86.54 



Ni 9. 20 12. 77 



Co 0. 33 0. 63 



Cu .' 0. 037 0. 02 



P 0.158 0.16 



S 0. 017 0. 03 



C 0.11 



Chromite trace 



Fe 2 3 trace 



99. 422 100. 26 



