8 LIST OF ILLUSTRATIONS. 



PAGE. 



45. Differences of mean annual temperature between woods and glade, and 



woods and plains, Swedish observations 85 



46. Diftereuce of air temperature in forest, glade, and plain (Swedish) 86 



47. Amplitude of W — G (lower curve) and W— O (upper curve) Swedish 



observations 87 



48. Differences of soil temperature at 20 inches depth 87 



49. Evaporation and precipitation 96 



50. Monthly evaporation in the fields (upper curve) and woods (lower curve), 



in inches 97 



51. Percentage of evaporation in the woods as compared with that in open 



fields 97 



52. Eatio of evaporation from water surface in fields (upper curve) and for- 



est (lower curve) to precipitation (top line) 97 



53. Percentage of evaporation in woods to that in the open air 98 



54. Percentage of precipitation, received under trees (all kinds). German 



observations 106 



55. Percentage of precipitation, received under trees (different kinds) 107 



.56. Px-ecipitation through trees at Cinq Franchees and Bellefontaine 108 



57. Snow bank before and behind a fence 119 



.58. Forest circulation 120 



59. Day circulation 120 



60. Night circulation 120 



61. Standing or ground- water spring 154 



62. "Fissure" spring 155 



63. Cavern spring 155 



