190 THE ROYAL SOCIETY OF CANADA 



Silicon 1.04 



Sulphur .'. . 0.07 



Phosphorus 0.16 



100.12 



The non-magnetic portion of the sample (being that composed 

 of the sulphides and silicates) presented a main problem in the de- 

 termination of what sulphides were actually present, in order that 

 the separate analytical results obtained might be used in interpreting 

 the mineralogical composition. 



Preliminary chemical examination gave the following indications 

 as to the nature of the sulphides: 



1st. — A slight odour of sulphuretted hydrogen was noticeable 

 during the fine grinding of a portion of the sample in an agate 

 mortar, and unmistakable sulphide stains were indicated when the 

 powder was dried on a bright copper plate. A one-gramme portion 

 was then boiled in water in a flask provided with suitable means for 

 examining the evolved gases. These latter gave convincing proof 

 of the presence of sulphuretted hydrogen, and after three hours' boiling 

 the liquid from the fîask gave after filtration a very distinct reaction 

 for calcium with ammonium oxalate. Upon these grounds it is 

 suspected that oldhamite is present in the meteorite. 



2nd. — When another portion of the ground sample was treated 

 with hydrochloric acid much sulphuretted hydrogen was evolved and 

 notable amounts ot iron passed into solution. The usual inference 

 was accepted that troilite is an abundant constituent, and its 

 amount is given by computing the Fe S, based on the total sulphur 

 remaining after deducting any amounts required for all other sulphides 

 proved to be present in determinable amounts. 



3rd.' — Chromium was found by chemical means to be present 

 entirely combined with iron as sulphide leaving no reasonable doubt 

 that the presence of daubréelite in small amount as one of the con- 

 stituents has been established. The determination of its amount 

 made it possible to allot the percentages of sulphur and iron as re- 

 quired in the calculations for daubréelite and troilite, and to state 

 the percentage of iron oxide in the non-magnetic portion. 



In regard to the method used to establish the nature of the 

 chromium-sulphur compound after considerable search that of J. L. 

 Smith was found and successfully applied in a modified form (see 

 separation of daubréelite in the Butcher meteoric irons of Coahuila, 

 American J. Science, p. 270, Vol. XVI, 1878). 



A weighed portion was digested with hydrochloric acid in a 

 flask through which a current of hydrogen was transmitted to prevent 



