84 THE ROYAL SOCIETY OF CANADA 



however, as the percentage given (0 . 69) is reckoned on a tenth gram 

 sample of the crystals. The deficiency in the analysis is due to the 

 presence of undetermined carbon. 



The crystals are very long, slender and brittle. In the micro- 

 photographs they frequently show cross fractures (PI. XII, Fig. 16) 

 and often have good sharp terminal faces (PI. XI, Fig. 14; PI. XII, 

 Figs. 15, 16; PI. XIII, Fig. 17). 



They are attracted by a horseshoe magnet, but less strongly 

 than the massive phosphide. 



Stead gives the melting point of FcsP as 1060°C. (FeNi)3P would 

 probably have an even lower melting point and it is difficult to under- 

 stand how crystals of this compound could be formed in the Kamacite 

 ground mass of much higher melting point. (Fe 1530° Ni 1452° 

 Co 1478°.) 



Analysis 5. — -Kamacite ground mass by fractional solution. 

 Since the ground mass of the iron dissolved readily in dilute 

 hydrochloric acid leaving the other constituents but little attacked, 

 it would appear that its composition might be determined approxi- 

 mately by analyzing the solution resulting from the action of the 

 acid during a short period. A 44 gram piece was roughly polished 

 on all sides and treated with 10% HCl until about 0.7 gram had 

 dissolved. The solution was analyzed with the following results: 



Fe 93.10 



Ni 6.39 



Co 0.48 



Cu 0.03 



100.00 



The amount of nickel and cobalt found is almost exactly one 

 per cent, less than the total for the iron as a whole (Analysis 1.) 



Physical Properties 



The Kamacite is soft (a polished surface is just scratched by 

 fluorite) and magnetic. In sections etched by bromine water it is 

 seen to occur as polygonal grains with definite boundaries (PI. XI, 

 Fig. 12) resembling the ferrite of ordinary iron. Under certain etching 

 conditions Naumaun lines appear. 



Analysis 6. — ^Chromiferous troilite-graphite nodule. 



On the edge of one slice about half a nodule remained attached 

 to the iron, the other half having been fused away. The nodule had 

 been between 1 .5 and 2 cm. in diameter and globular in form. The 



