454 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



18. 1857: VON REICHENBACH. Ueber die Meteoriten aus dem Tolucathale in Mexico. Ann. Phys. und Chem., 



Poggendorff, Bd. 102, pp. 621-625. 



19. 1860: WOHLER. Analyse eines mexicanischen Meteoreisens. Ann. Chem. Pharm., Bd. 115, pp. 95-96 (new 



analysis by Martius). 



20. 1861: ROSE. Ueber das Vorkommen von krystallisirtem Quartz in dem Meteoreisen von Xiquipilco in Mexico. 



Monatsber. Berlin. Akad., pp. 406-409. 



21. 1858-62: VON REICHENBACH. No. 4, p. 643; No. 20, p. 625; and No. 21, pp. 578, 579, 582, 584, and 587. 



22. 1863: ROSE. Meteoriten, pp. 60-62. 



23. 1869: MEUNIBH. Recherches. Ann. Chim. Phys., 4th ser., vol. 17, pp. 49, 50, and 51. 



24. 1875: VON RATH. Meteorite"n. Verh. naturhist. Verein, Bonn, Bd. 32, pp. 358-361. 



25. 1878: SMITH. On the composition of the new meteoric mineral Daubre'elite, etc. Amer. Journ. Sci., 3d ser., vol. 



16, p. 272. 



26. 1883: SMITH. Concretions. Amer. Joum. Sci., 3d ser., vol. 25, pp. 417, 418, and 419. 



27. 1884: WIEPKEN. Notizen fiber die Meteoriten des Grossherzoglichen Museums. 5: Xiquipilco im Thale von 



Toluca, Mexico. Abh. Naturwiss. Verein, Bremen, Bd. 8, pp. 527-528. 



28. 1885: BHEZINA. Wiener Sammlung, pp. 210, 211, 268 (Sieron Blanca), and 233. 



29. 1886: ANSDELL and DEWAR. On the gaseous constituents of meteorites. Proc. Roy. Soc., vol. 40, p. 554. 



30. 1887: FLIGHT. Meteorites, pp. 93-95. 



31. 1889: CASTILLO. Catalogue, pp. 3-4. 



32. 1890: FLETCHER. Mexican meteorites. Mineral. Mag., vol. 9, pp. 99, 103, 164-171, and 174. 



33. 1891: COHEN and WEINSCHENK. Meteoreisen-Studien. Ann. K. K. Naturhist. Hofmus. Wien, Bd. 6, pp. 



135-142 (analysis). 



34. 1892: COHEN. Meteoreisen-Studien, II. Idem, Bd. 7, pp. 157-158. 



35. 1895: LASPEYRES and KAISER. Mittheilungen aus d. mineralogischen Museum der Universitat Bonn. 36: 



Quarz-und Zirkonkrystalle im Meteoreisen von Toluca in Mexico. Zeitschr. fur Kryst., Bd. 24, pp. 485-493. 



36. 1895: BREZINA. Wiener Sammlung, pp. 274-275. 



37. 1895: COHEN. Meteoreisen-Studien, IV. Ann. K. K. Naturhist. Hofmus. Wien, Bd. 10, 1895, pp. 82, 86, 87, 90, 



91, and 92. 



38. 1899: COHEN. Meteoreisen-Studien, IX. Idem, Bd. 13, p. 484. 



39. 1900: COHEN. Meteoreisen-Studien, X. Idem, Bd. 15, pp. 77-79. 



40. 1900: COHEN. Meteoreisen-Studien, XI. Idem, Bd. 15, p. 390. 



TOMATLAN. 



Jalisco, Mexico. 



Here aho Fomatlan, Gargantillo, and Tulisca. 



Latitude 20 11' N., longitude 104 54' W. 



Stone. Spherical chondrite (Cc) of Brezina; Montrejite (type 38, subtype 1) of Meunier. 



Fell September 17, 1879. 



Weight, several stones, the largest not far from 1 kg. (2 Ibs.). 



This meteorite was described by Shepard 1 as follows : 



For my knowledge of the Fomatldn meteorite I am indebted to Mr. Carlos F. de Landero, engineer, of Guadalajara, 

 Mexico. Along with a fragment weighing 142 grams came his letter of March 11, stating that it formed a portion of a 

 stone that fell "about the end of the year 1883 on the farm of El Garganitello, near the coast in the State of Jalisco." 



The fragment is somewhat prismatic in shape, 2.5 inches long and 1.5 inches in each of its two other dimensions. 

 The broadest side retains the original black crust, which is rough and dull, with a thickness rather above the average 

 in meteoric stones. It is broken with medium facility, showing a rather lighter color than common in these bodies. 

 It abounds in pisiform grains of a pearl-gray or brownish color, varying in size from a pea downward to that of mustard 

 seed. The larger of these may be described as not strictly pisiform but rather flattened globules or imperfect crystals, 

 with rounded edges and angles. They often exhibit a single tolerably distinct cleavage in one direction, the traces of 

 another perpendicular thereto. 



The basis in which the globules are imbedded is rather peculiar. It is many shades lighter in color than the 

 globules, and is fine granular resembling certain massive albites. Under the lens it appears an intimate mixture of 

 the broken gray globules and a white mineral. This last in the field of the compound microscope is seen to consist of 

 sharply crystalline, transparent, or semitransparent grains, and closely resembles the chladnite of the Bishopville 

 meteorite. It should be mentioned that the pisiform globules situated within an inch of the crust are much stained 

 with iron rust. 



But the striking peculiarity of the Jalisco stone is the prevalence everywhere of octahedral crystals of nickeliferous 

 iron. These are so distinct as to be recognizable with the naked eye, the brilliant equilateral triangular faces coming 

 into view by every change of position in the specimen. Now and then a surface presents a pitted or dissected appear- 

 ance similar to what is common in quartz crystals. One or two instances were noted where a tendency to the arborescent 

 structure showed itself, the octahedra being aggregated in a common line, and only touching by the tips of their pyra- 

 mids. Neither the irregular globular form or the twisted pisiform shape of the substance, sometimes visible in meteoric 

 stones, is recognizable in the present case. 



