xvi LIST OF ILLUSTRATIONS 



PLATE PAGE 



23. Guarding and Staking 94 



24. Guards and Grills 97 



25. Guard-Rolling Machine. Seedlings. Watering- Cart. .. 103 



26. The Evolution of a Knot-Hole 116 



27. The Healing of a Pruning-Scar 118 



28. First Method of Removing Branch 122 



29. Second Method of Removing Branch 124 



30. Pruning Tools 131 



31. Injuries by Gas and Overhead Wires 141 



32. Injuries to Street-Trees 151 



33. Injuries to Street-Trees 156 



34. Life History of Tussock Moth 163 



35. Brown Tail Moth and Gipsy Moth 165 



36. Fall Webworm and Bag Worm 169 



37. Life History of Elm-Leaf Beetle 172 



38. Scalelnsects 176 



39. Borers 183 



40. Fungous Diseases. 188 



41. Fungous and Other Diseases 192 



42. Sprayers 210 



43. Filling a Large Cavity of an Elm-Tree 221 



44. Examples of Tree-Surgery 224 



45. Street-Planting by Municipal Tree Department . . , 237 



FIGURES 



FIG. PAGE 



1. Layout of a street fifty feet wide 67 



2. Layout of a street sixty feet wide 67 



3. Layout of a street eighty feet wide T 68 



4. Layout of a street one hundred feet wide 68 



