Variability of Bacteria in North Atlantic Sediments 527 



Fi^. 2. Regions from which marine sediment was collected. The counts 

 are based upon the following number of samples per region: Fundy 13; 

 Halifax 23; Northumberland 41; Shelf 32. Mean counts are shown for in- 

 dividual parts of the shelf region. Each is based upon counts of four samples 

 or less, hence they do not provide a basis for distinguishing one part of the 

 shelf from another and are grouped together as eight trips to one region. 

 The trip means were axeraged \'ia their logarithms to produce the final 

 results that are recorded in large numerals. 



