Club, Hercules', 109. Cockspur Thorn, 104. Coffee-tree, Kentucky, 95. Colchicum-leaved Maple, 87. Compositæ, 115. Coniferæ, 170. Cork-bark Maple, 87. Cork Elm, 134. Cork-tree, Chinese, 74. Cornaceæ, 110. Cornel, 111, 112. Cornelian Cherry, 111. Cornus, 110-112. Corsican Pine, 175. Corylus, 149. Cottonwood, 169. Cow-oak, 154. Crab-apple, 101. Crack-willow, 163. Cranberry-tree, 114. Crape-myrtle, 109. Cratægus, 103-106. Crisped-leaved Elm, 134. Cryptomeria, 198. Cucumber-tree, 63, 64. Cunninghamia, 191. Cupuliferæ, 144. Custard-apple Family, 68. Cut-leaved Birch, 146. Alder, 148. Cypress, Bald, 192. Lawson's, 196. Nootka Sound, 195. Southern, 192. Dahoon Holly, 77. Date-plum, 120. Deodar Cedar, 190. Devil-wood, 125. Diospyros, 119, 120. Dogwood, Flowering, 111. Poison, 90. Dotted-fruited Hawthorn, 106. Double Spruce, 179. Downy-leaved Poplar, 169. Dwarf Chestnut-oak, 155. Dwarf Mountain Sumac, 90. Ear-leaved Umbrella-tree, 64. Eastern Spruce, 181. Ebenaceæ, 119. Ebony Family, 119. Elæagnaceæ, 131. Elæagnus, 131, 132. Elder-leaved Mountain Ash, 102. Elder, Poison, 90. Elm, American, 135. Cork, 134. Crisped-leaved, 134. English, 134. Field, 134. Kiaka, 136. Red, 134. Rock, 134. Scotch, 134. Slippery, 134. Wahoo, 135. Weeping, 134. White, 135. White-margined, 134. Winged, 135. Witch, 134. English Elm, 134. Cherry, 99. Hawthorn, 104. Maple, 87. Oak, 158. Walnut, 141. Ericaceæ, 116. Euonymus, 78. Euphorbiaceæ, 132. Fagus, 160, 161. Fate-tree, 129. Field Elm, 134. Figwort Family, 127. Filbert, 149. Fir, Balsam, 183, 184. Cephalonian Silver, 185. Cilician Silver, 186. European Silver, 187. Fraser's Balsam, 184. Great Silver, 185. Japan Silver, 184. Noble Silver, 187. Nordmann's Silver, 184. Pinsapo, 186. Scotch, 177. Siberian Silver, 185. Silver, 184-187. Southern Balsam, 184. White, 186. Flowering Ash, 125. Dogwood, 111. Four-winged Silverbell Tree, 121. Fraser's Balsam-fir, 184. Fraxinus, 122-125. French Tamarisk, 69. Fringe-tree, 126. Garden Plum, 99. Red Cherry, 99. Garland Crab-apple, 101. Giant Arbor-vitæ, 194. Tree Lilac, 126. Ginkgo-tree, 201. Gleditschia, 95, 96. Goat-willow, 166. Golden-chain, 92. Golden Larch, 189. Gordonia, 70. Gray Birch, 145, 146. Pine, 178. Willow, 167. Great Laurel, 117. Great-leaved Magnolia, 64. Great Silver Fir, 185. Tree of California, 192. Green Ash, 123. Groundsel-tree, 115. Gum, Black, 112. Sour, 112, 113. Sweet, 108. Gymnocladus, 95. Gymnospermæ, 170. Hackberry, 136. Hackmatack, 188. Halesia, 121. Hamamelideæ, 107. Hamamelis, 107.