[Chap. XLVl 



UNDER-WATER ENVIRONMENTS 



591 



BACTERIA AND FUNGUS 



SPORES COLLECTED 



AT 36,O0O FEET 



MT EVEREST, 29,141 FEET 



y. yJMT. MCKINLEY. 20,300 FEET 



:j7///iu\\%_ 



DW ALGAE %\ "^ 



Fig. 269. The vertical distribution of living plants on the earth. 



