Plate 39 



1. Wood's Mountain, North Carolina; finest octahedrite; Ni-Co 8.61 percent. The 

 nickel-cobalt content is low for a finest octahedrite. An area at moderate magnification 

 showing an unusual variety of plessite fields. The general pattern of the iron is a regular 

 network of kamacite bands with very thin taenite lamellae. Light picral; X 30. 



2. Wood's Mountain. Areas from below upward — (a) light plessite field; (b) band 

 of granular kamacite; (c) band of dense plessite with tenuous taenite border; (d) kamacite 

 band with intergranular invasion of hydroxide; (e) light plessite field showing oriented 

 bands. Light picral; X 45. 



3. Wood's Mountain. A portion of areas (b) and (c) in figure 2 at high magnification. 

 The granulated kamacite band (below) shows a profusion of minute droplike bodies of 

 taenite along the grain boundaries. In the dense plessite band (above) the crowded taenite 

 particles show a tendency to orientation. \'ery light picral; X 600. 



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