INDEX TO HOSTS. 
Abies, 139. 
Acacia bark, 18G. 
Acer dasycarpum, 154. 
Acer negundo, 72. 
Acer saccbarinum, 15G. 
Acrideae, 171,172. 
Actinella acaulis, 88. 
iEcidium porosura, cups of, 83. 
iEsculus arguta, 94,144. 
Agropyrum, 30. 
Agropyrum divergens, 83. 
Agropyrum glaucum, 192. 
Agropyrum violaceum, 83. 
Agrostis exarata, 192. 
Agrotis, 170. 
Agrotis segetum, 170, 171. 
Ailanthus glandulosus, 78,147. 
Alisma plantago, 148. 
Allium mutabile, 67. 
Alnus, 41. 
Alocasia esculenta, 147. 
Althaea rosea, 151, 561. 
Amarantus blitoides, 10. 
Ambrosia artemisiaefolia, 7, 10, 94. 
Ambrosia psilostachya, 94. 
Amelanchier alnifolia, 81, 82, 190. 
Amelanchier Canadensis, 19. 
Amelanchier maculatum, 190. 
Amorpha fruticosa, 78. 
Ampelopsis quinquefolia, 155, 202. 
Ampelopsis veitchii, 202. 
Amygdaleae, 226. 
Androsace occidentals, 161. 
Anemone, 8. 
Anemone coronaria, 104, 224. 
Anemone multifkla, 80, 81, 83. 
Anemone nomorosa, 224. 
Anemone ranunculoides, 224. 
Anemono silvatica, 162. 
Andropogon Hallii, 12,13. 
Andropogon muricatum, 68. 
Andropogon provincialis, 12,13. 
Anisoplia, 171. 
Anisoplia austriaca, 173. 
Anthyllis vulneraria, 162. 
Apios tuberosa, 161. 
Aplippapus integrifolius, S3 
Apocynum, leaves of, 65. 
Apples, 35, 37,131. 
Apple trees, 79,106. 
Apple trees, roots of, 200. 
Apple, Fameuse, 210. 
Apple, Northern Spy, 210. 
Apricot, 222, 223. 
Apricot branches, 222. 
Apricot fruit,222. 
244 
I Apricot leaves, 222. 
Aquilegia Canadensis, leaves of, 74. 
Aquilegia Jonesii, 66. 
Aquilegia vulgaris, 162. 
Arabis, 85. 
Archangelica atropurpurea, 151. 
Armeria vulgaris, 162. 
Artemisia, 85. 
Artemisia biennis, 9. 
Artemisia cana, 31,81. 
Artemisia discolor, 191. 
Artemisia dracunculoides, 31,191. 
Artemisiae, 191. 
Artemisia frigida, 31. 
Artemisia Ludoviciana, 9, 31, 81,191. 
Artemisia tridentatn, 31, 67. 
Asclepias, 65. 
Aselepias rubra, 150. 
Ash, 95, 152. 
Asparagus, 147,158. 
Aster adscendens, 190. 
Aster canescens, 190,191. 
Aster comutatus, 81, 83,190,191. 
Aster conspicuus, 190. 
Aster cordifolius, 150. 
Aster foliaccus, 191. 
Aster laevis, 81, 85, ICO. 
Aster longifolius, 83, 190. 
Aster multiflorus, 190. 
Astragalus adsurgens, 194, 209. 
Astragalus Canadensis, 9,190. 
Astragalus decumbens, 190. 
Astragalus hypoglottis, leaves of, 69, 81,190. 
Astragalus multiflorus, 190. 
Astragalus triphyllus, 209. 
Athalia berberidis, 171. 
Balsamorrhiza sagittata, 81. 
Banana, 155. 
Bark, 185. 
Barley, 42,164, 218. 
Basswood, 79. 
Beans, 214. 
Beckmania erucaeformis, 192. 
Beech woods, 64. 
Beilis perennis, 104. 
Berberis, 85. 
B, rberis repens, 80, 81, 85. 
Berberis vulgaris, 160. 
Be tula, 41. 
Betula alnifolia, 67. 
Betula occidentalis, 81,193. 
Bidens, 7. 
Bidens chrysanthemoides, 7. 
Bidens connata, var. comosa, 7. 
I Bidens frondosa, 7. 
i Bigelovia, 81. 
