60 NEW YORK STATE MUSEUM 
Fig. 4 Sketch near bottom of the Lake mine, showing ore and pegmatite 
cutting wall rock, and fading away in it. The intimate relation between the 
ore and the pegmatite is likewise shown. 
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Fig.5 Sketch at north end of drift on 2800 foot level, Lake mine, show- 
ing the roll structure and its control of the form of the magnetite. 
