532 Marine Microbiology 



soil generally brings about an increase in the colony count that 

 is attributed to dispersal of the organisms by such treatment ( 7 ) . 

 The apparent absence of this effect from the present results may 

 indicate that bacteria in marine sediments are more dispersed 

 than tliose in ordinary soil. 



ACKNOWLEDGMENTS 



It is a pleasure to express thanks to the Fisheries Research 

 Board of Canada and to the Lamont Geological Observatory of 

 Columbia University for permission to participate in a joint 

 cruise of the vessels Sackville and Vema, which made possible 

 the observations on the Labrador shelf. 



Of several students who took part in this work, three deserve 

 particular mention, Misses: Heather Crowdis, Jill Garrard, and 

 Gail Mattinson. 



REFERENCES 



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2. EiSEHART, C. and Wilson, P. W.: Statistical methods and control in bac- 



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3. Fisher, R. A., Thornton, H. G. and MacKenzie, W. A.: The accuracy 



of the plating method of estimating the density of bacterial popula- 

 tions. Ann. Appl. Biol, 9:325-359, 1922. 



4. Hayes, F. R. and Anthony, E. H.: Lake water and sediment. VI. The 



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6. Strugger, S.: Fluoreszenmikro.skopie und Mikrobiologie. Verlag M. & 



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7. Waksman, S. a.: Principles of Soil Microbiology. Williams & Wilkins, 



Baltimore, 1927. 



