LETTER OF TRANSMITTAL. 



U. S. Department of Agriculture, 



Forest Service, 

 Washington, D. C, March 15, 1909. 

 Sir: I have the honor to transmit herewith, for publication as a Farmers' Bulletin, 

 Part II of A Primer of Forestry, bearing the subtitle Practical Forestry. This matter 

 was published in 1905 as Part II of Bulletin 24 of the Forest Service, for which there 

 is a great and continuing demand. To meet this demand Part I has already been 

 issued as Farmers' Bulletin 173, and the issuance of Part II in siriiilar form will make 

 the entire bulletin available for general distribution. The number of illustrations 

 has been considerably reduced. 

 Respectfully, 



GiFFORD PiNCHOT, FoTeSteT. 



Hon. James Wilson, 



Secretary of Agriculture. 



CONTENTS. 



Page. 



Forest management (illustrated) 3 



The service of the forest 3 



The uses of the forest 3 



Four requirements for the best service 6 



The yield of a forest 7 



Silvicultural systems 8 



Work in the woods (illustrated) 21 



Conservative lumbering 22 



Planting 29 



The weather and the streams (illustrated) 29 



Forests and climate 30 



Effect of forest cover on temperature 32 



Extremes of heat and cold _ 33 



Moisture in forest air 34 



Evaporation 34 



Rainfall 35 



Fallen rain 36 



Forestry abroad and at home 40 



Forestry abroad 40 



Forestry at home 44 



358 

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