SMITHSONIAN MISCELLANEOUS COLLECTIONS, VOL. 51 



GILMOP.E, PI. VI 



Fig. 1.--TVPICAL SANDBAR ON THE NOWITNA RIVER, 180 MILES FROM ITS MOUTH 



Fig. 2 .—LOOKING UP FOX GULCH, BONANZA CREEK, NEAR DAWSON, CANADA 



Sluice box in the ctnter, and the muck filling of the gulch not yet sluiced out may be 

 seen in the background on the right 



