460 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIIL. 



In 1S80 Brezina 4 noted the presence of Reichenbach lamellae in the iron and illustrated the 

 same. In 18S5 he 8 further described the structure as follows: 



Trenton has fine, short Reichenbach lamellae, straight, swollen, slightly grouped, with oriented luster, neither 

 striated nor spotted, fields and bands numerous, plessite not much darker than the kamaeite. To Trenton also belongs 

 a piece which Tschermak represented as a new locality, Milwaukee. Trenton lies near Milwaukee. No meteorite 

 peculiar to this locality is in existence, the two masses, moreover, agree in the smallest details, and, moreover, it is evident 

 from the outer form and direction of the lamella? that the supposed Milwaukee specimen and this of Trenton are cut 

 from the same original mass and from points very close together. Breadth of lamelke, 0.9 mm. 



Meunier 7 states that "the figure given by acids is remarkably regular and approaches 

 closely that of Caille." Cohen 8 states that Smith's term of Laphamite markings was erro- 

 neously given to what had previously been described by Reichenbach as combs. 



Cohen 9 found that the iron took on, more or less strongly, permanent magnetism. 



The meteorite is distributed, although the whereabouts of only 24 kgs. are given by Wulfing. 

 The University of Wisconsin is stated to have 10,400 grams and Harvard University 6,249 

 grams. In addition to the specimens reported by Wulfing the Milwaukee Museum has 22,049 

 grams, which includes four nearly complete individuals weighing 12,517, 3,586, 3,515, and 2,009 

 grams. * 



BIBLIOGRAPHY. 



1. 1869: Smith. A new meteoric iron. — "The Wisconsin Meteorites" with some remarks on Widmannstatten figures. 



Amer. Journ. Sci., 2d ser., vol. 47. pp. 271-272. (Analysis.) 



2. 1869: Brenndecke. On meteorites. — Extract from a discourse, February 7, 1869, before the Society of Natural 



History of Wisconsin. Rept. Smithsonian Inst. 1869, pp. 417^119 (analysis by Bode). 



3. 1872: Lapham. The Wisconsin Meteorite. Amer. Journ. Sci., 3d ser., vol. 3, p. 69. 



4. 1880: Brezina. Reichenbach'sche Lamellen. Denkschr. Wien, Akad., Bd. 43, p. 15 (illustration of etched 



plates). 



5. 1884: Wiepken. Notizen iiber die Meteoriten des Grossherzoglichen Museums. — 8. Washington County Wisconsin. 



Abhandl. naturwiss. Verein Bremen, Bd. 8, pp. 529-530. 



6. 1885: Brezina. Wiener Sammlung, pp. 152, 211, and 212. 



7. 1893: Meunier. Revision des fers meteoriques, pp. 52 and 58. 



8. 1894: Cohen. Meteoritenkunde, Heft I, pp. 107 and 193. 



9. 1895: Cohen. Meteoreisen-Studien IV. Ann. K. K. Naturhist Hofmus. Wien, Bd. 10, p. 82 

 10. 1897: Wulfing. Die Meteoriten in Sammlungen, p. 365. 



Trinity County. See Canyon City. 



Trinity County, New Mexico. See Glorieta Mountain. 



Troy. See Bethlehem.. 



TUCSON. 



Pima County, Arizona. 



Here also Ainsa, Arizona, Canada de Hierro, Carleton, Irwin, Muchachos, Ring Meteorite, Santa 



Rita, Signet meteorite, and Taos. 

 Latitude, 32° 58' N., longitude, 111° 10' W. 



Iron. Ataxite with accessory forsterite (DT) of Cohen, Tuczonite (type S) of Meunier. 

 Weight. Two masses, one of 688, the other 287 kgs. (1,514, 632 lbs.). 



From the great mass of discussion regarding this meteorite the following summary may be 

 given: Two masses of the meteorite are known, both found in a pass called Los Muchachos in 

 the Santa Rita Mountains, about 30 miles southeast of Tucson, Arizona. The original date of 

 the finding of these masses is not known but it may have been as early as the sixteenth century. 

 One of the masses is ring-shaped and weighed originally 1,514 pounds (6S8 kg.). Of this, 1,400 

 pounds (635 kg.), or essentially the whole mass, is in the United States National Museum in 

 Washington. This has been known by the names of Bartlett, Ainsa, Irwin, Ring Meteorite, 

 Signet meteorite, Santa Rita, Tucson, and combinations of the above names. The other mass 

 is elongated kidney-shaped and weighs 632 pounds (2S7 kg.). It is preserved practically entire 

 in the museum of the California State Mining Bureau in San Francisco. It has been known 

 under the names of Arizona, Carleton, Sierra de Santa Catarina, Tucson, and combinations of 



