108 BULIiETlN 184, imiTED STATES NATIONAL MUSEUM 



Popular Astronomy: The department entitled "Contributions 

 of the Society for Research on Meteorites" contains articles, descrip- 

 tions, bibliographies, lists, and other useful information, which are 

 collected and reprinted annually under that title. 



Illustrations. — Though photomicrographs of meteoric irons are 

 becoming commoner in scientific literature, the amount of such 

 illustrative material is still meager. The most instructive collection 

 of such pictures, 65 in number, including meteoric irons and artificial 

 alloys, accompanies Vogel's "tjber die Strukturformen," etc. (1927), 

 and a smaller number by the same author in "Eine umfassendere 

 Deutung," etc. (1932). See the literature cited. The publications 

 of Pfann (1917) and Berwerth (1918) include the earliest of such 

 photographs. 



Only a few new meteorites have been described by metallographic 

 methods with photomicrographs. One such description by Heide 

 and three by the author are included in the table of references. 



Metallography. — Hitherto no general treatise on the metallography 

 of meteoric iron has appeared, and information on that subject is 

 available only in articles in scientific and technical publications, 

 especially in those of the iron and steel trade, and in the proceedings 

 of scientific bodies. Most of these may be found in the libraries 

 of universities and technological institutions. 



Many of the more important of such articles have been referred 

 to in the text of this work and are listed alphabetically in the table 

 of references. 



Recent textbooks in English on metallography dealing with arti- 

 ficial irons and other metals, and in some cases with incidental 

 references to meteoric iron, are the following: 



A. S. M.: Metals handbook, 1939. 



Benedicks, C. : Metallographic researches, 1926. 



Berglund, T. : Metallographers' handbook of etching, 1931. 



BoYLSTON, H. M.: Introduction to the metallurgy of iron and steel, 1936. 



Carpenter, Sir H., and Robertson, J. M.: Metals (vol. 2), 1939. 



Chalmers, B.: Physical examination of metals, 1939. 



Desch, C: Metallography, 1937. 



Doan, G.: Principles of physical metallurgy, 1935. 



Eastwood, L. W. : Introduction to metallography, 1932. 



Ends, G. M.: Visual examination of steel, 1940. 



Epstein, S.: Alloys of iron and carbon, 1939. 



Greaves, R. H., and Wrighton, H.: Practical microscopical metallography, 



1926. 

 Heyn, E., and Grossmann, M.: Physical metallography, 1925. 

 Heyt, S.: Metallography, 1920. 



Jeffries, Z., and Archer, R. : Science of metals, 1924. 

 Kehl, G. L.: Principles of metallographic laboratory practice, 1939. 

 Marsh, J. S.: Alloys of iron-nickel (vol. 1), 1938. 

 Meyer, R. H.: Engineering physical metallurgy, 1939. 

 Reed, E. L. : Photomicrographs of iron and steel, 1929. 



