JCBTB0R1TB8. 227 



resists the tarnishing effects of vapours in the laboratory. By heat or 

 acid, Wiedraannstiitian figures are developed, with Laphamite markings. 

 Analysis gave : — iron, 91-15 ; nickel, 8-01 ; cobalt, 0-72 ; copper, 0-06; 

 sp. gr. 7' 7 17. At a red heat it absorbs 2-2 vols, of gas, consisting of: 

 — hydrogen, 71*04 ; carbon monoxide, 15*03 ; carbon dioxide, 13*03. 

 It is supposed that the meteorite was not sufficiently heated to fuse the 

 surface of the metal. P. W. K. 



Leonard, N. R. Iowa Co. Meteor and its Meteorites. Amer. Journ. 

 vol. X. pp. 357-363. 



Fell Feb. 12, 1875, in many fragments ; over 500 lbs. weight collected. 

 Sp. gr.=3*57. Consisted of troilite 5*82, nickeliferous iron 12*54, stony 

 matter 81*64. The last consists of about 54 p. c. olivine (approaching 

 hyalosiderite), 46 p. c. pyroxene. The path is fully described. T. G. B. 



Maskelyne, Prof. W. S. Some Lecture Notes on Meteorites. 

 Nature^ vol. xii. pp. 485, 504, 520. 



Pp. 485-487 describe phenomena attending several ffJls of meteo- 

 rites in the present century ; the appearance of the exterior of such 

 stones, and the probable cause of the same. Pp. 504-507 describe 

 their chemical and mineral composition. They are crystalline through- 

 out, and their minerals are commonly aggregated in small sphericles 

 (chrondritic structure). The minerals usually present are tabulated. 

 Pp. 520-523 discusses some theoretical considerations. T. G. B. 



Meunier, Stan. Remarques relatives a un Memoire de M. Tschermak 

 sur la geologic des meteorites. [Observations on a paper of M. 

 Tschermak's on the Geology of Meteorites.] Compt. Rend. 

 t. Ixxxi. pp. 1278, 1279. 



Note claiming prioi Ity in noticing several points common to meteorites 

 and terrestrial rock-masses. 



Mohr, Dr. Ueber die Natur und Entstehungsart der Meteoriten. 

 [Nature and Origin of Meteorites.] Liehig's Annalen, Bd. 179, 

 pp. 257-282. 



Bath, G. vom. Die Meteoriten des naturhistorischen Museum de 

 Universitiit Bonn. [The Meteorites of the Natural History 

 Museum of the University of Bonn.] Verh. nat. Ver. preuss, 

 Hheinl. 32 Jahrg. pp. 351-376. 



Smith, J. Lawrence. A note in relation to the mass of Meteoric Iron 



that fell in Dickson Co., Tenn., in 1835. Amer. Journ. vol. x. pp. 



349-352; Chem. News,\o\.xy.xi\. pp. 221, 222. 



The Iowa meteorite belongs to the most commonly occurring class of 



stones,, known as ChomJrites, or to Daubreo's section of Sporadosidcrites 



in the group of Oligosideriies. The mass consists of irregular splinters 



of olivine and an augite-like substance. A felspathic constituent 



appears in subordinate quantity ; and there are fragments of 



other minerals present. Mechanically rounded granules form an 



essential part of the eubstanco of the stone ; these are partly olivine, 



a 2 



