THIRD REPORT OF THE DIRECTOR I906 



81 



Memoirs 



2 No. 8 Insects Affecting Park and Woodland Trees. By E. P. 

 Felt. V. I, 46op. 48pL 



Contents: 

 Preface 

 Introduction 



Injuries caused by insects 

 Shade trees and adjacent prop- 

 erty affected 

 Definitions and classification 

 Important groups of insects 



affecting forest trees 

 Literature 



Transformations of insects 

 Parasitic and predaceous en- 

 emies 

 General preventive measures 



Birds 

 Remedial measures 

 Selection and planting of trees 



Bulletins 



Common shade trees and their 

 principal insect enemies 



More important shade tree pests 

 Destructive borers 

 Destructive leaf feeders 

 Destructive sucking insects 



The battle of the weak or interest- 

 ing facts about aphids 



More important forest tree pests 

 Enemies of deciduous trees 

 Wood and bark borers 

 Leaf feeders 

 Sucking insects 



Explanation of plates 



Index 



Geology 

 3 No. 95 Geology of the Northern Adirondack Region. By 



P. Gushing. 



H. 



Contents: 



Introduction 



Summary of geologic history 



Precambric history 



Early Paleozoic history 



Later Paleozoic changes of level 



Paleozoic disturbances 



Paleozoic igneous activity 



Paleozoic erosion 



Mesozoic history 



Cenozoic history 



Glacial history 



Postglacial history 



The rocks 



Precambric rocks 



Paleozoic rocks 



Rock structures 



Foliation 



Folds 



I5pl. 3 maps. 



Paleozoic rocks (coitiiiucd) 



Faults 



Joints 

 Topography 



Introduction 



Prepotsdam topography 



Paleozoic topography 



Appalachian uplift 



Mesozoic base-leveling 



Peneplains 



Main axis of elevation 



Lake belt 



Faults as topographic features 



North plain 



Northern hills and valleys 



Streams 



Lakes 

 Index 



4 No. 96 Geology of the Paradox Lake Quadrangle. 



Ogilvie. 54p. I7pl. map. 

 Contents: 



Bv I. H. 



Introduction 



Topography and geology of the 

 Adirondacks 



Recent geologic work 

 Location and topography of the 



Paradox Lake Quadrangle 

 Physiography and glaciology 



Cambric drainage lines 



Peneplains 



Summary of the preglacial ero- 

 sion history 



Age of lower base-level 



Glacial deposits and drainage 

 modifications 



General geology 



Summary of evidence of relative 

 age of igneous rocks 



Petrography 

 Petrography of sedimentarj^ rocks 

 Petrography of igneous rocks 

 Summary and conclusions 



Economic geolog}' 



Index 



