CONTENTS. 



Page. 



Introduction 9 



Itinerary 10 



Persoiiuel 15 



Provious publications 15 



New .species 16 



General features 17 



Effects of scanty nu)isture 19 



Glacial basins 20 



Cauyons L'l 



Streams 23 



Rock slopes 25 



Avalanches 26 



Timberline 27 



Forests of Shasta 30 



The yellow pine belt 30 



The Shasta fir belt 36 



The white-bark pine belt 39 



Forest lires 16 



Efiects of burns in changing zone positions .. 17 



Slope exi)osure 47 



Effects of steep slopes 51 



Basin slopes 52 



Life zones of Shasta 52 



Upper Sonoran zone 53 



Transition zone 54 



Canadian zone 61 



Iludsonian zone 64 



Alpine zone 67 



The Boreal fauna and llora of Shasta contrasted with corresponding faunas and 



floras of the Sierra and the Cascades t)9 



Efficiency of Klamath Gap as a barrier to P.oreal species comi»ared with that 



of Pitt River and Feather River gaps collectively 83 



Sources of the P)oreal faunas of Shasta and of the Sierra and the Cascades ... 85 



Manmials of Shasta 87 



Birds of Shasta and vicinity 109 



Notes on the distribution of Shasta plants 135 



5 



