CONTENTS, 



I'aga. 



Intiodnction ^^ 



Geographical distribution H 



Character of distributiou, by regions 1- 



Notes oil general distribution ^^ 



Conclusipus reganliug natural distribution 16 



The Wliite Pine lumber industry 16 



Original stand and present supplies 13 



Natural history - 20 



Botanical description -" 



Relationship -1 



Morphological characters 21 



Root, stem, and branch sxsten; 21 



Leaves 22 



Floral organs 22 



Seeds 23 



Seed sujiply 23 



The -n-ood 24 



Growth aud development 26 



Rate of growth -' 



Height growth -^ 



Seedling stage 27 



Development in open stand 28 



Development in the forest 30 



Effect of composition of forest upon height growth 32 



Effect of locality upon height growth 33 



Growth ill thickness 34 



Detail measurements of annual gain in circumference 35 



Area accretion 36 



Form development, or taper 36 



Growth in volume 37 



Cubic contents of trees 38 



Lumber contents of trees 38 



Conditions of development 39 



Demands upon climatu and soil 39 



Associated species 10 



Light rei|Uirements 43 



Yield of White Pine -11 



Dangers and diseases. ■*■ '19 



Injuries by human agency 49 



Injuries by storms 50 



Diseases 51 



Efl'ect of heat and drought 51 



Parasitic diseases 51 



Insect enemies of the White Pine. By F. 11. Chittenden, Division of Entomology 55 



Introduction 55 



The destructive pine bark-beetle 55 



Remedies 56 



Other injurious bark-beetles •- 56 



Timber-beetles and other Scolytida- .^7 



Pine sawyers and other borers 57 



The white-pine weevil 58 



Moth caterpillars and plant-lice on trunks and limbs .^9 



Leaf-feeding insects 60 



5 



