360 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



tains, as Port Orford at present is quite a small settlement although a 'port of entry.' The meteorite might be shipped 

 in the California steamer to San Francisco and from that port in a sailing vessel round the Horn to Boston." 



********* 



In another letter Doctor Evans says: "As to the dimensions of the meteorite I can not speak with certainty, as no 

 measurements were made at the time. But my recollection is that 4 or 5 feet projected from the surface of the mountain, 

 that it was about the same number of feet in width and perhaps 3 or 4 feet in thickness; but it is no doubt deeply buried 

 in the earth, as the country is very mountainous, generally heavily timbered, and subject to washings from rains and 

 melting of snow in the spring, so that in a few years these causes might cover up a large portion of it. The mass exposed 

 was quite irregular in shape." 



Buchner 5 stated that Evans estimated the weight of the portion above ground at 10,000 kgs., 

 also states that Jackson found by analysis: 



Fe Ni Sn and some Si0 2 



89 10.29 0.729 =100.019 



Buchner's authority for these statements does not appear in the references which he quotes, 

 which are those of Jackson and Haidinger already given. 



Brezina 8 in 1885 grouped it as a pallasite and described it as follows: 



It shows enveloping kamacite bands small (0.5 mm.), slightly puffy, and fields 3 to 10 mm. in size with a few bands 

 near the border measuring 0.2 to 0.3 mm., the balance having a fine luster. The Vienna specimen also possesses a 

 fusion crust. 



A photograph of the Vienna specimen is given by Brezina and Cohen 7 and the following 

 description: 



It shows the swathing kamacite small (0.5 mm.), against the field less swollen than against the olivine. The field 

 is exceptionally large in comparison to the breadth of the swathing kamacite, is generally filled with shimmering plesaite, 

 and contains, near the edge, some small bands 0.2 mm. wide, which originate from the swathing kamacite or in one place 

 seem to lie free in the plessite. In the photograph a tongue of troilite with kamacite border projects into the field. 

 Here and in the upper half of the swathing kamacite some small, elongated schreibersite may also be recognized. 

 Tsenite is weak. As far as can be determined from so small a piece Port Orford corresponds with no other pallasite. 



In 1895 Brezina 8 remarked: 



It is somewhat different from Krasnojarsk and Arizona, the enveloping kamacite being less puffy, thinner, more 

 angular, and more easily etched, so that it does not appear so different from plessite and does not remain blank. 



Only 4 grams of the meteorite are known to be preserved. This is in the Vienna collection. 



BIBLIOGRAPHY. 



1. 1860: JACKSON. Proc. Boston Soc. Nat. Hist., vol. 7, pp. 161, 174, 175-176, 279, and 289. 



2. 1860: HAIDINOEH. Einige neuere Nachrichten fiber Meteoriten, namentlich die von Bokkeveld, New-Concord, 



Trenzano, die Meteoreisen von Nebraska, voni Brazos, von Oregon, Sitzber. Wien. Akad., Bd. 41, p. 572. 



3. 1861: HAIDINGER. Meteoreisen von Rogue River Mountain in Oregon und von Taos in Mexico, gesandt von Hrn. 



Dr. Charles T. Jackson. Sitzber. Wien. Akad., Bd. 44 II, pp. 29-30. 



4. 1861: JACKSON. Biographical sketch of the late John Evans, M. D. Amer. Journ. Sci., 2d ser., vol. 32, pp. 



313-314. 



5. 1863: BacHNER. Meteoriten, p. 131. 



6. 1885: BREZINA. Wiener Sammlung, pp. 206 and 233. 



7. 1886: BREZINA and COHEN. Photographien, pi. 6. 



8. 1895: BREZINA. Wiener Sammlung, p. 264. 



Port Tobacco. See Nanjemoy. 



PRAIRIE DOG CREEK. 



Decatur County, Kansas. 



Latitude 39 35' N., longitude 100 20' W. 



Stone. Crystalline spherical chondrite (Cck) of Brezina. , ; 



Known since 1893; described 1895. 



Weight, 2.9 kgs. (7 Ibs.). 



The first description of this meteorite was by Weinschenk, 1 as follows: 



This meteorite was discovered upon a farm belonging to N. E. Miller, north of the north branch of Prairie Dog 

 Creek, Decatur County, Kansas. It was found for the most part buried in the soil. I examined several small frag- 

 ments. These were somewhat weathered and had a rough thick crust of a brownish-gray color. 



