LIST OF ILLUSTRATIONS xvli 



PAGE 



FIGTTRE 



74. Picea Engelmanni 283 



75. Picea pungens 283 



76. Picea Omorika 287 



77. Pseudolarix amabilis 289 



78. Larixdecidua 291 



79. Cedrus libani 294 



80. Pinus flexilis 304 



81. Pinus Strobus 307 



82. Pinus canariensis 311 



83. Pinus densiflora 313 



84. Pinus sylvestris 314 



85. Pinus Mugo var. pumilio 316 



86. Pinus nigra var. austriaca 317 



87. Pinus nigra var. cebennensis 318 



88. Pinus Thunbergii 319 



89. Pinus ponderosa 321 



90. Pinus halepensis 324 



91. Pinus virginiana 325 



92. Pinus Banksiana 326 



93. Pinus rigida 328 



94. Pinus attenuata 329 



95. Pinus Torreyana 331 



96. Injurious effect of ordinary rich garden soil on a rhododendron . 338 



97. Beneficial effect of aluminum sulfate on Rhododendron maximum . 339 



The photographic plates are largely of specimens in the Arnold Arboretum, 

 Boston; others are from the Hunnewell estate, Wellesley, Massachusetts and 

 Mr. Brett's plantation in Connecticut; others are from various sources. The 

 engravings of species of plants in the text, all prepared for this work, are mostly 

 made from material supplied by the Arnold Arboretum. 



