XVI 



Fig. Page 



144. Canker of the wild blackberry 606 



145. Frost spots on pear bark 608 



146. 147. Blight spots on pear trunk 610, 611 



148*, 149. Internal frost wounds on an oak branch 618, 621 



150.' Curve for tinding night frosts 631 



i':;!. Cross-section through sunburn spot in leaf of Clivia itobilis 643 



152, 153, 154- Light and shade leaves of the beech 660 



155! Twig of cherry with gum cavity 701 



156. Nuclei of gum-forming tissue 704 



157. Tracheidal parenchyma of Piiius Strobus with resiniferous layer 713 



158. 159, if>o, 161. Resin centers in amber 714-716 



162! bat leaf killed by chlorin fumes 726 



163. Beech leaf affected by sulfurous acid 727 



164. Birch leaves injured by sulfurous acid 728 



165. Rose leaf injured by chlorin fumes 728 



166. Beech leaves injured by chlorin fumes 728 



167. Birch leaves injured by chlorin fumes 729 



168. Virginia creeper, strawberry and rose leaves injured by tar fumes 733 



169. 170, 171. Apples injured by spraying with Bordeaux mixture 763, 764 



172. Apple leaf with dead spots and holes after spraying with Bordeaux mixture. .765 



173. 174. 173- Scaritication wounds 777, 778 



176. Hollow pine trunk 779 



177. Section of trunk of Picca ruUiaris with overgrowth of the resin channels 780 



178. Overgrowth of the cut surface of a branch 783 



179. 180, 181. Cross-section of a year-old cherry branch 786 



182, 183, 184, 185. Ringing wound on a grapevine 789-795 



186. Callus formation from young bark cells in ^ barked trunk 802 



187, 188, 189. New tissue formation on a barked cherry trunk 805-808 



190, 191, 192, 193, 194. Xew tissue formation at bend in an apple twig 811-813 



195. Injury to a branch due to twisting 815 



196. Constriction in branch due to a wire ring 819 



197. Inichsia cutting . 822 



198. Rose cutting 823 



199. Budded rose 832 



200. Bark graft of .'\esculus, with adventitious buds 837 



201. Pine with natural in-arching of a second trunk 848 



202. Stoppage of ducts in a grapevine, due to wound decay 853 



203. Alder root, barked by the tread of feet 856 



204. Gnarlly overgrowth cap of the stump of an oak branch 860 



205. Bark tubers from an apple trunk 866 



206. Isolated wood centers in the bark of a year-old pear branch 869 



207. Callus formation in a leaf of Leucojum vcnimn 872 



208. Leaf cutting of a begonia 875 



