1887.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 603 



iu spots with a black crust similar to that Ibimd on tli^ mass, but on 

 the lower side the crust extends completely around the side of the nod- 

 ules, showing the fusion very plainly. The troilite is very bright and 

 fresh, like a newly broken mineral, and on the upper side one of the 

 nodules shows deep striation, suggesting that the entire nodule is one 

 crystal and the exposed part is only one side of it. In some cases where 

 the nodules were broken they were found to be iridescent. This is one 

 of the octahedral irons showing the Widmanstiittcn figures beautifully 

 on etching (see fig. 1), and is one of the Caillite groups of Stanislas 



Fig. 1. 



Fio. 2. 



Meunier and o{ the miftlere UDueUen oi Hrezma. The lainellai are 1'"'" 

 wide and the markings more closely approach the Rowton* and Maza- 

 pilt irons. Figure 2 shows the etching on the surface of the unpolished 

 exterior, there being no crust. The lower end of the figure, which is flat, 

 was produced by the hammering off of the piece ; but the etching is 

 really finer where it was done on the natural surface of the iron. The 

 specific gravity of the small piece figured is 7.773. Troilite, as before 

 stated, is very abundant iu the mass. Schreibersite and carbon have 

 also been found between the lamina;. Chlorine is present only in slight 

 quantity, as scarcely any deliquescence has been observed. 



The following is a comparative table of analyses of meteoric irons most 

 nearly approaching this in composition : 



' A. .T. Scienco, TIT -series, vol. xis, pp. 459-4G3, Cbarlotte. 



-i'hil. Tran.s. oftlie. Koyal Society, part HI, 1882, pp. 8J4-89G, llowtou. 



•'A. J. .Science, III series, vol. xxxiii, l)p. 221-22G, Mazaj)!!. 



' A. J. Science, Til series, vol. x, i)p. 349-.'?52, Estlierville. 



'' A. J. Science, III .series, vol. xx.Kiii, p. 494, Cabin Creek. 



From the fact that the ridged side is so free from crust and the flat 

 side so thickly coated ; that the ridged side is covered with stri;D and 



" Meteoriteu Siimmlung des k. k. miueralogischcs Ilofcabinct in "Wicn., 8vo, Wien, 

 1885, PI. 2, lig. 2. 

 t American Journal Science, scries III, vol. xxxiii, p. 2'J5, fig. 2. 



