OF ARTS AND SCIENCES. 



93 



Date of Fall or Find. 



No. 



Weight 



iu 

 Grams. 



Found 1874. 



1,185 



388 



Fell 1S74. 



May 11, 11| p. m. 



355 



275.5 



173.5 



167 



87.5 



356 



Description. 



there is every gradation between coarse, 

 typical Widmanst'attian figures and the 

 finest microscopic markings. [Smith 

 Collection.] 



A cleavage octahedron broken out of 

 the previous specimen. All the faces 

 were perfectly smooth except part of 

 one which was hollowed out by coming 

 in contact with the crust. One etched 

 face of this octahedron is shown in 

 Fig. 15. By following the Widman- 

 stattian figures on to adjacent faces 

 of the octahedron, it was found that 

 nearly all, including the finest micro- 

 scopic markings, were due to plates 

 parallel to octahedral faces, the only 

 exception being the markings seen in 

 the diagram perpendicular to the octa- 

 hedral edges, and these proved to be 

 due to plates parallel to a face of the 

 rhombic dodecahedron. 



* Three polished faces at right an- 

 gles, and the rest of the surface covered 

 with crust. [Smith Collection.] 



* Beautifully etched slab with a nod- 

 ule of troilite in the middle of it, and 

 the crust on one end. [Smith Collec- 

 tion.] 



* Similar to previous specimen. 

 [Smith Collection.] 



Also a two-gram nodule of troilite. 



Me.jillonf.s, near Desert of Atacama, 

 South America. 



Belonging to the Pallas group, but 

 very fine-grained. The specimen shows 

 a crust, and on three polished faces the 

 iron appeal's very unequally distrib- 

 uted, usually iu small grains hardly 

 forming a continuous network, but oc- 

 casionally large masses of iron appear. 

 [Purchased of Ward and Howell.] 



* Three polished faces; also shows 

 crust and fracture. [Smith Collection.] 



* Similar to previous specimen. 

 [Smith Collection.] 



* Five cut faces, and shows crust and 

 fracture. [Smith Collection.] 



Sevrukovo, 

 Russia. 



near Belgorod, Kursk, 



