xiv CONTENTS 



CHAPTER XII 



PAGES 



Forestry axd Timber 202-220 



Planting Xotes '^^^ 



NuraiTy planting-table for forest trees, 202 — Forest planting, 



1-03. 



Eardness of Common Commercial Woods 204 



Forest Yieldn 204 



Approximate time required to produce wood crops, 204 — Yield 

 of white pine, 206. 



Life of Fence- Pouts and Shingles 207 



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

 of fenco-post.s, 207 — Prolonging the life of shingles, 209 — Sug- 

 gestions for couiinunity action, 210. 

 Board Mf'asure .......•.•• 210 



Curd Measure ........... 211 



Log Measure ........••• 212 



Scribner decimal log rule, 214. 



U. S. Purest 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 Bound 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. 



Applicatiun 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, 22.') — Rhode Island experience with iron sulfate, 226 — 

 South DakoU experience with iron sulfate, 220— Ohio experi- 



