INDEX TO VOLUMES X, XI AND XII. 
Adiantum, 180. 
Agar, 13. 
Agarics, 177, 247, 349. 
Allograpta obliqua, 533. 
Anatomy of Unionidae, 331. 
Ancient vegetation, Ohio, 312. 
Apocynum, 469. 
Apocynum hypericifolium, 184. 
Apple blotch, 334. 
Apples, 406. 
Arnheim formation, 429. 
Asclepias rubber, 271. 
Bacterial flora, 137. 
Bembex, 163. 
Biological club, meetings, 15, 63, 
152, 192, 216, 248, 272, 287, 352, 
384, 458, 549. 
Biological club, organization, 190. 
Birds, Darke Co., Ohio, 420. 
Blister rust of white pine, 285. 
Bog, Cedar, Ohio, 193. 
Bog, evaporation, 17. 
Boletaceae, collecting, 267. 
Bolbodimyia, 150. 
Botrychium habitat, 8. 
Buckeye Lake, physiography, 517. 
Buckeye Lake, plants, 305. 
Carrot, wild, 474. 
Cedar bog, Ohio, 193. 
Cedar Point, flora, 61, 473. 
Myxomycetae, 472. 
Naiades, 183. 
pollination notes, 378. 
Stratiomyidae, 299. 
Celithemis, 153. 
Cerastium arvense webbii, 136. 
Chytridiales, 44. 
Cincinnati geanticline, 429. 
Classification of plants, 289, 409. 
Cleveland plants, 475. 
Climatic conditions, southwestern 
Ohio, 385. 
Coleoptera, 1. 
Collybia tuberosa, 247. 
Coniferae, 10. 
Cranberry Bog, 305. 
Cuyahoga Co. lichens, 543. 
Cuyahoga Co. plants, 471. 
Cystopteris, 181. 
Darke Co. birds, 420. 
Dictyoneuron, 224. 
Didea fuscipes, 137. 
Diptera, 307, 374, 513. 
Drosophila, 374. 
Ecological conditions, 312. 
Economic Monocotyls, Ohio, 214. 
Endomychidae, 461. 
Erax, 307. 
Erysiphaceae, 166. 
Eupatorium, 287. 
Eupatorium aromaticum, 304. 
Evaporation gradient, 347. 
Evaporation in bog, 17. 
Ferns, Mahoning Co., 86. 
Ferns, new varieties, 179. 
Film test, 146. 
Flora, Cedar Point, 61, 473. 
Floristic Survey, 200. 
Geology, S. Amer., literature, 273. 
Girdler, Twig, 1. 
Graminaceae, 490. 
Grasses, taxonomy, 490. 
Gymnosperms, Ohio, 9. 
Horseflies, 149. 
Insects affecting maple, 36. 
Jassidae, 261. 
Kelps, self-dividing laminae, 217. 
Laboratory guide, 40. 
Labrador tea, 13. 
Lake Co. plants, 471. 
Leaf markings, 243. 
Ledum, 13. 
Lepidoptera, 233. 
Lepidoseloga, 149. 
Lessoniopsis, 221. 
Licking Reservoir, 17. 
Lichens, northern Ohio, 543. 
Lichens, Ohio, 41. 
Life-histories, Syrphidae, 397. 
Limestone, Pennsylvanian, 89. 
Macrocystis, 222. 
Macro-Lepidoptera, 233. 
Mahoning Co. ferns, 86. 
Mallows, Ohio, 465. 
Maple insects, 36. 
Medicinal plants, 55, 73. 
Merycomyia, 515. 
Mice, Ohio, 65. 
Mitremyces cinnabarinus, 350. 
Mocking bird, 14. 
Moles, Ohio, 494. 
Monochytrium, 44. 
Monocotyls, economic, Ohio, 214. 
Myxomycetae, 472. 
Naiades, Ohio, 183. 
Natural history survey, 263. 
Nereocystis, 219. 
New Ohio plants, 39, 246, 457. 
