THE METALLOGRAPHY OF METEORIC IROiN 105 



both as to artificial and natural irons. More than a decade ago it 

 was applied by Leonhardt (1927) to the study of meteoric irons, 

 and it has been used by Heide (1932) to determine the crystallization 

 of schreibersite and cohenite; by Borchert and Ehlers (1934) to 

 determine the orientation of schreibersite inclusions with respect to 

 the planes of kamacite ; by Smith and Young to determine the nickel 

 content of taenite bodies and the orientation of their planes; by 

 Mehl and Smith (1934), Melil, Barrett, and Jarabek (1934), and 

 Mehl and Derge (1937) in studies of the Widmanstatten structure; 

 and by Bradley (1939), Bradley and Goldschmidt (1939), and Owen 

 and Sully (1939) in discussions of meteoritic structures and in sup- 

 port of certain suggested changes in the iron-nickel diagram. 



The scope of this work has permitted no more than incidental 

 references to the results of such investigation, but in the bibliography 

 works are mentioned that should be useful to those who wish to 

 pursue the subject further. 



XVIII. BIBLIOGRAPHY 



Systematic treatises.- — The older literature on meteorites is exten- 

 sive, and it is important from the standpoint of descriptive, chemical, 

 and mineralogical treatment. There are, however, only the follow- 

 mg systematic treatises on the subject: 



Emil Wilhelm Cohen: Meteoritcnkunde, 3 volumes: Volume 1, 

 419 pp., 1894; volume 2, 302 pp., 1903; volume 3, 419 pp., 1905, 

 published in Stuttgart. This great work treats the entire subject 

 in all its aspects. The third volume was intended to include full 

 descriptions of all meteorites, but that effort was cut short by the 

 author's death. Fortunately, however, it contains descriptions of 

 all ataxites, hexahedrites, and fuie and finest octahedrites, then 

 known. Very full references accompany every description and 

 chapter. 



Oliver Cummings Farrington: Meteorites, their structure, 

 composition and terrestrial relations, 233 pp., 1915, Chicago. This 

 valuable work, well illustrated, was prepared to supply the need of a 

 treatise in English on meteorites. It summarizes much of the 

 information contained in the works of Cohen and of other writers. 



George Perkins Merrill: Composition and structure of meteor- 

 ites. U. S. Nat. Mus. Bull. 149, 62 pp., illus., 1930. A general 

 treatise, with many excellent illustrations. The photographs of 

 irons are at lov/ magnification. 



Stanislas Meunier: M6t6orites. Encyclopedic chimique, vol. 

 2, 532 pp., 1884. Though of minor value now, this work contains 

 many descriptions and important observations on composition and 

 structure in the light of the knowledge then available. 



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