70 THE ROYAL SOCIETY OF CANADA 



11.84 kilogrammes. The surface showed the usual circular de- 

 pressions found on meteorites; these measured from 1}^ to 5 centi- 

 metres across and were relatively quite shallow. 



Except on the summits of the prominences which have been noted 

 the colour was throughout of a dull iron black though the surface was 

 quite smooth to the touch. The summits of the prominences were 

 coated with a thin brownish incrustation in which impressions of 

 grass blades were well defined. This incrustation, which was alien 

 to the primary character of the specimen, was found to consist of 

 numbers of microscopic plates of selenite intermingled with hydrated 

 oxide of iron. On the slope of the smaller of the two prominences 

 there was exposed a nodular mass of iron sulphide measuring 3 to 5 

 centimetres in diameter. Apart from a slight tarnish this mass 

 showed no particular evidences of oxidation though it must have been 

 freely exposed to weathering influences. 



When sectioned and rubbed down first with fine carborundum 

 and then with jeweller's rouge this iron was found to take a moderately 

 bright polish generally, although a zone about 2 millimetres in width 

 extending all the way around the edge appeared much brighter than 

 did the central portions. Even previous to the employment of 

 etching solutions the Widmanstatten figures became distinctly visible 

 when the polished section was viewed obliquely; examined in this 

 way the field was marked by several series of fine parallel lines brighter 

 as to lustre than the general groundmass. 



When the polished section was treated with a 2-per cent, solution 

 of picric acid in alcohol etching proceeded slowly; the major portion 

 of the plate was visibly acted upon, but the material giving rise to 

 the bright lines was to all appearances unaffected and remained in 

 the end as salient ridges lying between the kamacite bands and dis- 

 posed in such a way as to indicate an octohedral structure for the iron. 

 It was later found that a 10 per cent, solution of nitric or hydrochloric 

 acid had no appreciable action either on the material of these narrow 

 bands or on some minute acicular crystals found enclosed in the 

 kamacite bands — a condition of which full advantage was taken by 

 the junior author of this paper in separating the various minéralogie 

 constituents of the meteorite for analysis. 



The kamacite bands were found to vary in width from 1 milli- 

 metre to 4 millimetres — the greater number from 23^ to 3 millimetres 

 — so that the iron may be classed as a coarse octahedrite. 



When a slightly etched plate is examined under a magnification 

 of 40 to 50 diameters the kamacite plates exhibit a minute octohedral 

 structure and an abundant development of small needles of schreiber- 



