SMITHSONIAN EXPLORATIONS, I93I 



137 



Fig. 129. — The Knight cave was unlighted, unventilated and half filled 

 with disintegrated rock and dust finer than flour. From a flashlight photo- 

 graph before excavation. 



Fig. 130. — Many tons of rock and earth were removed in hand buckets 

 through the constricted cave entrance to be carefully screened in the open 

 air. Dust masks were indispensable. 



