ILLUSTRATIONS. 



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Fig. 1. White pine (Pinus strobus), leaves and cones 10 



2. Tamarack (Larix laricina), leaves and cones 10 



3. Aspen (Populus tremuloides), trunk 11 



4. Aspen ( Populus tremuloides ) , leaves and capsules 12 



5. Bay berry ( Myrica cerifera), leaves and fruit 14 



6. Butternut (Juglans cinerea) , trunk 15 



7. Ironwood ( Ostrya virginiana ) , leaves and fruit 16 



8. Sweet birch (Betula lenta), trunk 17 



9. Sweet birch (Betula lenta), leaves, catkins, and fruit 17 



10. Tag-alder ( Alnus rugosa) , leaves, catkins, and fruit 18 



11. White oak ( Quercus alba), trunk 19 



12. White oak ( Quercus alba) , leaves and acorns 19 



1 3. Slippery elm ( Ulmus pubescens), trunk 20 



14. Slippery elm ( Ulmus pubescens), leaves, flowers, and fruits 21 



1 5. Cucumber-tree (Magnolia acuminata), leaves 21 



16. Umbrella-tree ( Magnolia tripetala ) , leaves 22 



17. Sweet bay ( Magnolia glauca), leaves and fruitiug cones 23 



18. Tulip-poplar (Liriodendron tulipifera), trunk 24 



19. Tulip-poplar (Liriodendron tulipifera), leaves, flowers, and fruit 24 



20. Sassafras (Sassafras sassafras), leaves and fruits 25 



21. Spicebush (Benzoin benzoin), leaves, flowers, and fruits 26 



22. Witch-hazel (Hamamelis virginiana), leaves, flowers, and capsules 27 



23. American mountain-ash (Sorbus americana), leaves and fruits 29 



24. Wild cherry (Prunus serotina), trunk 30 



25. Wild cherry (Prunus serotina), leaves, flowers, and fruits 30 



26. Southern prickly ash (Xanthoxylum clava-her •cutis), trunk 32 



27. Southern jjrickly ash (Xanthoxylum clava-her cutis) , leaves, fruits, and 



branchlet showing prickles 32 



28. Wafer-ash ( Ptelea trifoliata ) , leaves and fruits 33 



29. Black alder ( Ilex verlicillata) , fruits 34 



30. Wahoo (Euonymus atropurpureus) , leaves and fruits 35 



31. False bittersweet ( Celastrus scandens), leaves, flowers, and fruits 36 



32. Horse-chestnut (Aesculus hippocastanum) , trunk 37 



33. Horse-chestnut (Aesculus hippocastanum), leaves and fruits 37 



34. Cascara sagrada (Ehamnus purshiana), five-year-old tree 38 



35. Cascara sagrada (Rhamnus purshiana), leaves and fruits 39 



36. Cotton ( Gossypium hirsutum) , leaves, flowers, and bolls 41 



37. Dogwood ( Cornusflorida), trunk 42 



38. Dogwood ( Cornusflorida), leaves, flowers, and fruits 42 



39. Moose wood (Dirca palustris ) , leaves and flowers 43 



40. White ash ( Fraxinus americana), trunk 44 



41. White ash (Fraxinus americana), leaves and fruits 44 



42. Fringe-tree ( Chionanlhus virginica) , leaves and flowers 45 



43. Bittersweet (Solanum dulcamara) , leaves, flowers, and fruits 46 



44. Buttonbush (Cephalanthus occidentalis) , leaves and flowers 47 



45. Black haw and nanny-berry ( Viburnum prunifolium and V. lentago), 



leaves and flowers 49 



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