CONTENTS. 



epartment bulletin no. 151. — experiments in crop production on 

 Fallow Land at San Antonio: 



Introduction 1 



Climatic conditions 1 



Soil conditions 2 



Fallowing experiments 2 



Vegetative growth of crops on fallowed land 4 



Soil-moisture studies 5 



Summary 10 



Department Bulletin No. 152. — The Eastern Hemlock: 



Introduction 1 



Geographical range 2 



Commercial range 3 



Amount of standing timber 4 



Value of standing hemlock 5 



Utilization of hemlock 7 



Structure and development of the tree 15 



Associated species j 21 



Effect of light, soil, and moisture on the composition of the stand 22 



Reproduction 23 



Rate of growth 24 



Susceptibility to injury 27 



Hemlock in forest management 29 



Appendix 31 



Department Bulletin No. 153. — Forest Planting in the Eastern United 

 States: 



Opportunities for forest planting 1 



Status of forest planting in the region 3 



Establishment of plantations 6 



Care of plantations 13 



Mistakes in tree planting 21 



Yields and returns 22 



Individual species 23 



' Appendix 36 



Department Bulletin No. 154. — The Life History of Lodgepole Pine 

 in the Rocky Mountains: 



Geographic distribution and altitudinal range 1 



Size, age, and habit . 2 



Climatic, soil, and moisture requirements 3 



Light requirements 6 



Reproduction 9 



Growth 16 



Causes of injury 19 



Associated species 26 



Permanency of lodgepole type 27 



Ground cover 28 



Age classes 28 



Yield 29 



Department Bulletin No. 155. — Wood Pipe for Conveying Water for 

 Irrigation: 



Introduction 1 



History 2 



Continuous stave pipe 3 



Machine-banded pipe 24 



Durability of wood pipe and factors affecting it 33 



3 



