The Bacteria in Natural Waters. 



13 



In sea-water, too, bacterial numbers are small as noted 

 by RusseU at Naples (RusseU, 1891) and Wood's Hole 

 (Russell, 1892), and in salt as in fresh water the amount 

 of bacterial life decreases in general as one passes down- 

 ward from the surface and outward from the shore. Otto 

 and Neumann (1904) obtained the results summarized 

 below at various points on the high seas between Portugal 

 and Brazil. Near the European coast, numbers were 

 inuch higher. 



BACTERIA nsr THE ATLANTIC OCEAN. 



(OTTO AND NEUMANN, 1904.) 

 Bacteria per c. u. 



Nearest Land. 



Canary Islands . . 

 Cape Verde Islands 

 St Paul Island . . 

 Pernambuco . . . 



