Index to Volumes XIII, XIV and XV. 



Smilax Herbacea, Cytological Study 

 357. 



Soil Bacteria, 273. 



Solanacese 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. 

 Trifoliese of Ohio, 443. 

 Viciese of Ohio, 393. 

 Violets of Ohio, 56. 

 Xyridaceas of Ohio, 129. 

 Yellows on Raspberry, 281. 



