INDEX. 



A. 



Agricultural districts, necessity for 

 preservation of trees in, 14, 15. 



Agriculture, demands of, for re- 

 moval of forests, 11. 



Aims of forestry, 10. 



Air, changes in composition of, ef- 

 fects of, on earth's life, 166, 167. 



Alps of Provence, Marsh on, 115, 

 116. 



Amazon, forest lands of, 28. 



Animal and vegetable kingdoms, 

 wonderful balance in the compo- 

 sition of the atmosphere insured 

 by, 142. 



Animals, minerals and plants, mu- 

 tual interdependence between, 

 168. 



Animals, necessity for oxygen in 

 respiration of, 141. 



Animate enemies of the forest, 64, 

 71 to 76. 



Annual Report of New York For- 

 estry Commission, extract from, 

 18, 19. 



Assimilation, definition of, 22. 



Atmosphere, composition of, 140. 

 different composition of, in ge- 

 ological past, 143, 144. 

 heat received from the heated 



earth, 119. 



heat received from the sun by 

 absorption, 119. 



Atmosphere, manner in which it 

 receives heat from the sun, 

 119. 



possible danger from disturb- 

 ance of composition of, by 

 removal of forests, 144, 145. 

 purification of, 140 to 145. 

 Avalanche, influence of, in destruc- 

 tion of forests, 67. 

 Axe of pioneer, a badly- chosen 

 emblem of civilization, 85. 



Balance of nature, 164 to 173. 

 Bannwoelder, 67, 68. 

 Basin of river, definition of, 111. 

 Beavers, destruction of forests by, 



73. 



Beech plum, story of, 35, 36. 

 Beetles, destruction of forests by, 75. 



Calcareous soils, definition of, 51. 

 Carbonic acid, decomposition of, in 

 plants by sunshine, 22. 



influence of, on growth of 

 plants, 22. 



influence of, when dis- 

 solved in water, in dis- 

 integration of rocks, 55. 



necessity of, for existence 

 of plants, 142. 



of atmosphere, use of, 140. 



21* 



246 



