EXPLANATION OF PLATE IV 
Map of Hidden Glacier 
Hidden Glacier reaches the sea at the head of a short arm, branch¬ 
ing from Russell Fiord. The whole of the arm is included in the 
map. For general relations of the locality, see the map of Yakutat 
Bay, figure 26. For description of the glacier see pages 52-58. 
Surveyed by Henry Gannett, June 20, 1899. The chief instrument 
used was a plane-table, and all stations were on the delta plain between 
the glacier and the sea. The special purpose of the work was to re¬ 
cord the positions, at the time of survey, of the ends of the glacier and 
delta. 
Office drawing by Gilbert Thompson. 
