METEORITES OF NORTH AMERICA. 459 



Analysis of the metallic portion extracted by an electromagnet and dissolved by copper sulphate gave: 



Fe Ni Co 



88.74 10.68 58 =100.00 



Further study of the soluble and insoluble silicates gave the following as the probable constitution of the 

 meteorite: 



Metallic 2.23 



Troilite 5. 03 



Soluble i acids 39. 84 



Insoluble in acids 52. 42 



99.52 



Wulfing 2 inquired if this meteorite does not belong to the same fall as Bluff, and it seems 

 not impossible that such is the case. The distance from Bluff to the border line of Travis 

 County is only 40 miles and it is well known that pieces of the Bluff meteorite were widely 

 distributed. The external appearance of the meteorites is also similar. The analysis of Travis 

 County shows some differences from that of Bluff, especially a higher percentage of silica and 

 the presence of alkalies. 



Brezina, 3 in Ward's catalogue, classes Travis County as a black chondrite and Bluff as a 

 brecciated crystalline chondrite. It is possible, therefore, that the differences are sufficient to 

 warrant regarding the falls as separate. 



BIBLIOGRAPHY. 



1. 1890: EAKDJS. A new stone meteorite. Amer. Journ. Sci., 3d ser., vol. 39, pp. 59-61; also Bull. U. 8. Geol. Sur- 



vey No. 78, pp. 91-93. 



2. 1897: WUUING. Die Meteoriten in Sammlungen, p. 365. 



3. 1904: WARD. The Ward-Coonley Collection of Meteorites, p. 66. 



TRENTON. 



Washington County, Wisconsin. 



Here also Milwaukee, Washington County, 1858, and Wisconsin. 



Latitude 43 22' N., longitude 88 8' W. 



Iron. Medium octahedrite (Om), of Brezina; Caillite (type 18), of Meunier. 



Found 1858; described 1869. Further masses found 1869, 1871. 



Weight: Six masses weighing 65 kgs. (143 Ibs.). 



This meteorite was first described by Smith 1 as follows: 



These meteorites were first brought to my notice by Mr. I. A. Lapham, of Wisconsin, and his attention was called 

 to them by Mr. C. Daflinger, secretary of the German Natural History Society of Wisconsin. They were discovered 

 in the town of Trenton, Washington County, Wisconsin, and I have called them the "Wisconsin meteorites." Up to 

 the present time fragments have been found indicating that these meteorites were of the same fall and separated at 

 no great elevation. They were found within a space of 10 or 12 yards, very near the north line of the 40-acre lot of 

 Louis Korb, in latitude 43 22' north and longitude 88 8' west from Greenwich, and about 30 miles northwest of Mil- 

 waukee. They were so near the surface as to be turned up with the plow. They weigh respectively, 60, 16, 10, and 

 8 pounds and present the usual pitted and irregular surfaces. The largest of the meteorites in its extreme dimen- 

 sions is 14 inches long, 8 inches wide, and 4 inches thick, weighing 62 pounds. Its specific gravity is 7.82 and 

 composition: 



Fe Ni Co P Chi Insoluble 



91.03 7.20 0.53 0.14 trace .45 =99.35 



A polished surface when etched gives well-marked Widmannstatten figures. There ia something, however, pecul- 

 iar about the markings on this iron, which ia doubtless common to other irons, but which has heretofore escaped my 

 observation; and I can not discover, in a hasty investigation, that it has been noticed by others. My attention was 

 called to this peculiarity by Mr. Lapham, on a slice of the meteorite I sent him etched. Should these markings be 

 entitled to a separate notice, I propose calling them "Laphamite markings." 



An analysis by Bode 2 gave the following results : 



Fe Ni Co P 



89.22 10.79 trace 0.69 =100.70 

 Specific gravity, 7.3272. 



In 1872 Lapham 3 reported the discovery of two additional masses of the meteorite weighing, 

 respectively, 16.25 and 33 pounds. These, he states, were found in the same field as the others. 



