W. P. Blake — Meteorite from Green County ', Tenn. 45 



than the breadth. Iu composition it is an alloy or mixture of 

 nickel and iron with the nickel in larger quantity relatively to 

 the iron than in the mass. 



This deportment in acid indicates the diffusion of granules 

 of a nickel alloy less soluble than the bulk of the iron. . It is 

 possible however that the separation of these grains may be 

 the result of mechanical action attending rapid solution, and 

 the evolution of gas disintegrating the iron, producing small 

 grains, from the surface of which the iron is dissolved faster 

 than the nickel. Either view of the origin of the granules sus- 

 tains the conclusion that this meteoric iron has a granular 

 structure, which is but another phase of the still unexplained 

 phenomena of the aggregation, or structure, of meteoric irons r 

 whether they are distinctly crystalline or are made up of layers 

 differing in composition. The granular condition is more like 

 that of electrolytic iron than the crystalline or banded forms 

 and it may be regarded as lending additional support to the 

 theory of electrical deposition. 



Compared with some other meteoric irons with oxidized sur- 

 faces it is found to resemble the iron from Dalton, Whitfield 

 County, Georgia, now in the collection of Professor Shepard„ 

 This meteorite has a brown and scaly coating but the iron has 

 traces of geometrical structure. It is stated that when this Dal- 

 ton meteorite was found, one mass of iron was sent off to Cleve- 

 land, Tennessee, and has since been lost sight of. Another 

 meteorite from Green County, Tennessee, is described as hav- 

 ing an oval flattened form with a coating of specular iron pene- 

 trating for half an inch or more the mass of iron. Specific 

 gravity 7*43. No crystalline structure and no nickel was 

 found, but three per cent of carbon, chromium, and tin.* Ex- 

 cept in composition and gravity this iron compares closely with 

 the subject of this paper. 



According to Prof. Shepard, a meteorite from Grreen Co., 

 Tenn., contains 14*7 per cent of nickel.f The Tazewell County, 

 Tennessee, meteorite, in which the late Prof. J. Lawrence Smith 

 found solid protochlorid of iron was oxidized in some places 

 one quarter of an inch deep. It exhibits crystalline structure 

 and contains 15 per cent of nickel. Gr. 7*884 



The iron of Campbell Co., Tennessee, also attracts moisture 

 and exhibits regular crystalline figures. According to Willett§ 

 an iron from Putnam Co., Georgia, was covered with a brown 

 scaly crust, and freshly cut surfaces soon became moist with 

 drops of a liquid supposed to be chlorid of iron. Structure be- 

 came visible by etching. 



* This Journal, xvii, 329. f Ibid, vol. xvii, p. 327. 



% Ibid, xvii, p. 137. § Ibid, xvii, 331. 



