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"because of climatic conditions. I'he cypress, limited to the South 

 by climatic factors is further confined to the swamps, by reason of 

 moisture requirements. The pitch pine, tho not necessarily con- 

 fined to dry sandy plains, exists under those conditions of soil 

 and moisture where few other trees can live. 



The requirements of trees may vary with the species and even 

 with the individuals; in some cases, however, the requirements are 

 very definite, and certain trees, or groups of trees, are recog- 

 nized as characteristic of certain locations. The American larch 

 is recognized as belonging to the swamp, althb it may occur on 

 hillsides; the red cedar is characteristic of hillsides and old 

 pastures, tho it may grow in swampy places. 



The conditions required by a given kind of tree create what is 

 termed a habitat for that tree. The northern swamps, for example, 

 provide features favorable to the growth of the American larch, 

 balsam, black ash, red maple and others. The presence of these 

 trees, by adding protection against sun and wind to the original 

 condition of the swamp, create other features which constitute a 

 habitat for other forms of life, uy the development of a series 

 of such conditions or eonsequences, a community of many forms of 

 plant and animal life is created and held together. The forest, 

 then, must be considered as a community of many forms of life. 



I'lants, by their nature, are confined to a more or less 

 definite habitat and location. Annimals are, for the most part 

 able to move about, and can, therefore, be assigned only to a 

 general habitat. Certain forms, however, may be recognized as 



