Index to Volumes X, XI and XII. 
Nodding, diurnal, 474. 
Nothomyia, 301. 
Odonata, 153. 
Ohio agarics, 177, 247, 349. 
birds, 420. 
gymnosperms, 9. 
lichens, 41. 
mallows, 465. 
medicinal plants, 55, 73. 
mice, 65. 
moles and shrews, 494. 
naiades, 183. 
orchids, 24. 
plants, 39, 160, 185, 246, 457. 
Polyporaceae, 353. 
powdery mildews, 166. 
rubber, 469. 
Unc inula, 351. 
Oncideres, 1. 
Open valley, 210. 
Ophioglossum, 8. 
Orchard Island, 200. 
Orchids, Ohio, 24. 
Paragus, 397. 
Pennsylvanian limestones, Ohio, 89. 
Peridermium, 285. 
Perilla, 427. 
Perisporiales, 166. 
Phacelia dubia, 303. 
Phlox stolonifera, 261. 
Phyllosticta solitaria, 334. 
Physiography, Buckeye Lake, 517. 
Plants, classification, 289, 409. 
Ohio, Barnesville, 160. 
Ohio list, excluded, 185. 
on dumping ground, 475. 
New Ohio, 39, 246, 457. 
Pleurotus, 247. 
Pollination notes, 378. 
Polyporaceae, Ohio, 353. 
Postelsia, 220. 
Potato agar, 13. 
Powdery mildews, Ohio, 166. 
Rubber, 469. 
Rubber, crude, 146. 
Rubber, Ohio grown, 271. 
Rust, white pine, 285. 
Scaphoideus, 249. 
Selasoma, 150. 
Self-dividing laminae, 217. 
Seneca Co. Lepidoptera, 233. 
Shrews, Ohio, 494. 
Snowiellus, 151. 
Soils, unproductive, 137. 
South Amer. geology, 273. 
Southwestern Ohio, climatic con- 
ditions, 385. 
Spirodela, winter-buds, 181. 
Stibosoma, 516. 
Stratiomyidae, Cedar Point, 299. 
Symbiotes, 461. 
Syphaerophoria cylindrica, 538. 
Syrphidae, 337, 397, 477, 533. 
Syrphus, 477. 
Syrphus torvus, 341. 
Tabanidae, new species, 513. 
Tabanus, 513. 
Tallant collection, 266. 
Taxonomy of grasses, 490. 
Tinobregmus, 261. 
Twig girdler, 1. 
Uncinula, Ohio, 351. 
Unionidae, 331. 
Valley, open, 210. 
Viola hirsutula, 232. 
Wasps, 163. 
Winter-buds, Spirodela, 181. 
Woodlot, evaporation gradient, 347. 
Xerophytic adaptations, 184. 
