148 ROCHESTER ACADEMY OF SCIENCE. 



the octahedral group and to that division (No. 56) which is designated 

 as Broad Octahedrite Og. But this structure is somewhat dimmed by 

 numerous small flakes of a very much brighter and more lustrous iron 

 than are the kamacite blades, and seeming to have no regular or 

 definite form— the largest of them having a diameter of not more 

 than 6 to 7 mm.. These plates, at least in part, are apparently hexa- 

 hedral, as some of the larger ones show Neumann lines on their 

 etched surface. The patches of plessite are decidedly small, but 

 occasionally show the alternating layers of kamacite and plessite 

 formerly known as " Lapham Markings." The taenite lines are 

 plainly visible along the edges of the kamacite plates. There are 

 numerous small troilite nodules from i to 3 mm in size scattered 

 promiscuously throughout the section, and a few rod-shaped ones 

 I mm in width, and in some instances up to 15 mm in length. The 

 largest troilite nodule found in several sections was 28 mm in diameter. 

 It incased several small patches of the nickeliferous iron. No schrei- 

 bersite is apparent to the eye, nor would it be expected from the small 

 amount of phosphorus found in the analysis of the iron. The exterior 

 of the mass in our possession is of a dull reddish brown color, much 

 oxidized, with a tendency to scale in small flakes. The fractured 

 surface of this iron is much more coarsely granular in structure than 

 is that of any iron with which I am familiar. 



Perhaps more about the inner structure of the iron may be 

 developed as the mass is further sectioned. 



The above observations on the structure of the Willamette iron 

 are made by my assistant, Mr. H. L. Preston, who has had my small 

 mass (a few kilogrammes) in hand, in Rochester, for section. 



Two analyses of the Willamette iron have been made for me ; 

 one by Mr. J. M. Davison of the University of Rochester; the other 

 by J. J. Whitfield of Philadelphia. We give these below : 



DAVISON WHITFIELD 



Iron, - - - - 91.65 Iron, ... - 91.46 



Nickel, - - - 7.88 Nickel, - - - 8.30 



Cobalt, . - - .21 



Phosphorus - - .09 



The specific gravity of the iron is 7.7. 



Henry A. Ward, 



620 Division Street, Chicago, III. 



