Index to Volumes XIII, XIV and XV. 
Smilax Herbacea, Cytological Study 
357. 
Soil Bacteria, 273. 
Solanaceae of Ohio, 235. 
Spelerpes Larvae, Induced Modifica¬ 
tions in Pigment Development, 
49. 
Sprouting of Cocklebur, 216. 
Spiders of Ohio, 215. 
Starch Reserve in Birch and Maple, 
317. 
Starfish in the Richmond, 221. 
Strobilophyta, Synopsis of, 106. 
Syrphidae, 205. 
Life-Histories, 81. 
Middle America, 333. 
Syrphus xanthostoma, 81. 
Tabanus, 225. 
Tobacco, Mosaic Disease, 151. 
Tomatoes, Inheritance of Size, 473. 
Mosaic Disease, 149. 
Transpiration in Relation to Growth 
241. 
Trifolieae of Ohio, 443. 
Vicieae of Ohio, 393. 
Violets of Ohio, 56. 
Xyridaceae of Ohio, 129. 
Yellows on Raspberry, 281. 
