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기돌스킹 | 2012.03.11 | 조회 518

But there are many other classes of bacteria which do not



exist in a condition approaching isolation in nature. Such are the



vast groups of non-parasitic forms which carry on important


 


processes in the soil, in the sea, in rivers, etc. For the study of


such organisms it must be allowed that the method of pure cultures


is strikingly artificial and that one must not therefore be disappointed


 


if in using such a method one fails to elucidate their


natural activity, or to reproduce in the laboratory the phenomena


occurring in the field. Bacteria concerned with important processes


 


in the soil, for example, have been found, when studied in


pure culture, to yield most unexpected and apparently contradictory


 


results, which may doubtless be traced to this artificial change


of environment, and it is certain that our knowledge of these


 


orgauisms would be materially advanced if attempts were also


made to study them when associated with the forms accompanying


 


them in nature. Hitherto this has rarely been done, but the


following examples may serve to illustrate the point.


 


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