THE ROYAL SOCIETY OF CANADA 



There is a general regularity in the distribution of the two, however, 

 as indicated in the diagram of a polished surface below, the lamellae 

 of 38% Ni alloy being arranged in groups in each of which a well- 



Diagram showing parallel arrangement of lines of phosphide, 

 normal to parallel lamellae of 38% nickel alloy. Heavy black 

 lines indicate phosphide; light lines indicate -8% nickel alloy. 



marked parallelism is usually evident. The phosphide in a similar 

 way appears as irregular, but roughly parallel wandering lines which 

 take a direction nearly normal to that of the lamellae of 38% Ni alloy, 

 and form a capping, as it were, to the spaces included between the 

 38% Ni alloy lamellae. The phosphide thus contributes about half 

 of the cell wall of eutectic enclosing the areas of ground mass. 



For the study of the structure, as described above, a rectangular 

 section of the meteorite about 1 cm. in cross-section with all sides 

 polished was found to be very useful as the structure could be followed 

 completely in all three dimensions. 



A slight qualification to the above statements is necessary, viz., 

 that the lines of phosphide do not always appear to come into actual 

 contact with the lamellae of the high nickel alloy, but sometimes stop 

 short within a very small distance from them so that the cell walls of 

 high nickel alloy and phosphide are not absolutely continuous, though 

 very nearly so (PI. X, Figs. 11, 12). 



The ground mass which forms the major portion of the metal is 

 seen on a polished surface in general as roughly rectangular areas 

 enclosed by lines of phosphide and 38% nickel alloy. When etched 

 by bromine water each area of ground mass is seen to consist of a 



