XIV CONTENTS 



CHAPTER XII 



PAGES 



FORESTRY AND TIMBER 202-220 



Planting Notes 202 



Nursery planting-table for forest trees, 202 Forest planting, 



203. 



Hardness of Common Commercial Woods 204 



Forest Yields 204 



Approximate time required to produce wood crops, 204 Yield 



of white pine, 205. 

 Life of Fence-Posts and Shingles 207 



Durability of fence-posts in Minnesota, 207 Prolonging the life 



of fence-posts, 207 Prolonging the life of shingles, 209 Sug- 

 gestions for community action, 210. 

 Board Measure ........... 210 



Cord Measure 211 



Log Measure ........... 212 



Scribner decimal log rule, 214. 

 U. S. Forest Service Log-Scaling Directions . . . . . 214 



Allowances for taper, 216. 

 Cubic Log Measure 216 



Method by measurement of length and middle diameters, 217 



By length and end diameters, 217 Solid cubic contents of logs, 



218. 

 Cubic Contents of Square Timber in Hound Logs . . ' . . 218 



The two-thirds rule, 219 The inscribed-square rule, 220. 



CHAPTER XIII 



WEEDS 221-233 



General Practices ; 221 



Annual weeds, 221 Biennials, 222 Perennials, 222. 

 Chemical Weed-killers or Herbicides . . . . . . .223 



Salt, 223 Copper sulfate (blue vitriol), 223 Iron sulfate, 223 



Kerosene, 223 Carbolic acid, 224 Sulfuric acid (oil of 

 vitriol), 224 Caustic soda, 224 Arsenical compounds, 224. 



Application of Herbicides 224 



Gravel roadways, gutters, tennis courts, walks, 224 List of 

 weeds that may be controlled by means of chemical sprays, 225 



List of weeds on which present spraying methods are not effec- 

 tive, 225 Rhode Island experience with iron sulfate, 225 

 South Dakota experience with iron sulfate, 226 Ohio experi- 



