464 APPENDIX. 



fir and spruce are the best producers, beech next, and pine, 

 the most light-needing species, but also the most frugal as to 

 soils, produces the least. Our White Pine compares probably 

 more nearly to the spruce. The usual actual production falls, 

 to be sure, considerably below these figures. The entire pro- 

 duction of wood per acre of all the German forests is esti- 

 mated as 50 cubic feet] per acre per annum, or a total harvest 

 of 1750 million cubic feet, half of which is timber wood and 

 probably 4 billion feet B.M. saw material. For France the 

 entire product is estimated at 356,000 million feet, or less than 

 40 cubic feet per acre. 



NOTES TO CHAPTER VII. 



P. 177. Sprouting Capacity of Conifers. — The only conifer 

 which sprouts vigorously and produces shoots growing into 

 trees seems to be the Redwood {Sequoia sempervirens) of our 

 Pacific coast. Indeed, the peculiar appearance in the location 

 of some of the old giants in a circle suggests that these even 

 may have originated as sprouts froin stumps of still older 

 trees. 



NOTES TO CHAPTER VIII. 



P. 213. Soil-rent Theory. Practicability and Profitable- 

 ness of Silviculture. — The economic basis for forest manage- 

 ment is not the same everywhere, hence the methods of 

 calculating the productive -capacity must vary. The soil-rent 

 idea can apply only in highly developed, densely populated 

 countries, where the closest use of soils is imperative. 



Agriculture is not, as a rule, attempted on soils wliich do 

 not promise a satisfactory return or soil rent, while the forest, 

 finally, is relegated to the agriculturally useless soils which 

 would bring no rent by other use. On account of the diffi- 

 culty of transportation of forest products, location is of more 

 moment than the natural fertility of the soil. While this 

 limitation may be overcome by the building of roads and rail- 



