124 Field Columbian Museum — Geology, Vol. III. 



fresh. The completely encrusted individuals are of irregular, angular 

 shapes, with angles slightly rounded, as is usual in meteorites. Sev- 

 eral, however, show projecting spurs of toothed form which are unus- 

 ual. No. 10, Plate XXXIX, is especially notable for these. The 

 three views given of this individual show its orientation. The broad 

 surface with rounded shallow pits was the rear side, the opposite the 

 front side. As shown by the side view, the individual is fragmentary. 

 The individual found by the writer, shown in Plate XXXVIII, has 

 a roughly tetrahedral form with one of the faces of the tetrahedron 

 broken up into three planes. The faces are nearly all slightly concave 

 and show only a few broad pittings. A marked feature of the surface 

 is a whitish deposit occurring on several of the faces. This deposit is 

 more or less streaked in appearance and the direction of the streaks is 

 such that they would meet in a common point if produced. Exam- 

 ined under a lens the deposit is seen to be a fine powder embedded in 

 the interstices of the slaggy crust. It is soluble without effervescence 

 in hydrochloric acid but is so small in quantity that further determina- 

 tion of its nature cannot be made. The simplest explanation of its 

 origin would seem to be to regard it an efflorescence due to weathering, 

 as the meteorite had been exposed five months to the elements when 

 found. The uniformity of direction of the streaks is somewhat diffi- 

 cult to account for on this hypothesis, however. One of the upper- 

 most faces, moreover, is entirely free from the deposit. The deposit 

 lies on what was undoubtedly the forward portion of the meteorite in 

 falling and the radiation of the streaks from a common point suggests 

 that it was made during flight. In either case the phenomenon is new 

 to the writer's experience. The individuals shown in Plate XL were, 

 as already stated, fragments when found, and no adjoining parts have 

 yet been discovered in the vicinity so far as the writer is aware. The 

 encrusted portion of one is seen to be deeply pitted, the pits varying 

 in form and size on the different surfaces. On one surface they are 

 abundant, small and uniformly distributed, on others fewer in number, 

 larger and deeper. The complete individual was evidently of tabular 

 form and about 2 inches (5 cm.) thick. One of the broad surfaces is 

 remarkably flat and shows well-marked divergent lines of flow on the 

 crust. The other individual shown in this plate illustrates the 

 internal veins which occur in some specimens. These veins are 

 evidently only armor faces produced by slipping. They are planoid 

 in character and run in various directions which often intersect. 

 The crust of most of the individuals is dull and coal-black in color, 

 though of reddish tone in some individuals. Crackling of the crust 

 into irregular polygonal areas is a common and characteristic feature, 



