INDEX TO VOLUME VI 
Reid, F. R. (See Skinner, J. J., 167) 
Rock, Joseph F. Cyrtandreae Hawiienses, 
Sections Schizocalyces Hillebr. and Chae- 
tocalyces Hillebr.; 47, Sect. Microcalyces 
Hillebr., 203 
R61e of sedges in some Colorado plant com- 
munities, 120 
Root-cap celts, viability of, 309 
Sando, Chas. E. Endothia pigments. H. 
Endothine red, 242 
Sedges, role of, in Colorado plant com- 
munities, 120 
Septoria atro-purpurea, 26; brunellae, 21; 
cirsii, 20; convolvuli, 16; helianthi, 23; 
lactucae, 10; lactucicola, 9; lepidiicola, 22; 
lycopersici, 22; malvicoli, 15; polyg- 
onorum,^ 6; rubi, 26; scrophulariae, 16; 
septulata, 16, 19; tritici, 12; verbascicola, 
19 
Septoria, biologic specialization in, 7 
Sex, inheritance of, in Mercurialis, 410 
Sexual characters, distribution of, in Fun- 
aria, 387 
Skinner, J. J., and Reid, F. R. The 
influence of phosphates on the action of 
alpha-crotonic acid on plants, 167 
Steinberg, Robert Aaron. A study of 
some factors in the chemical stimulation 
of the growth of Aspergillus niger, 330, 
357 
Stevens, Neil E., and Morse, Fred W. 
The effect of the endrot fungus on cran- 
berries, 235 
455 
Stewart, Alban. A consideration of cer- 
tain pathologic conditions in Ambrosia 
trifida, 34 
Stimulation of the growth of Aspergillus 
niger, 330, 357 
Stomata, influence of light on, 131 
Structure of protoplasm, 273 
Sugars, influence of, on the growth of albino 
plants, 401 
Thaxter, R. (See W. G. Farlow, p. 301) 
Transpiration, relation of, to action of light 
on stomata, 131 
Twiss, W. C. A study of plastids and 
mitochondria in Preissia and corn, 217 
Variations in Pleurage curvicolla, 406 
Venation and senescence of polyembryonic 
Citrus plants, 311 
Viability of detached root-cap cells, 309 
Weimer, J, L. Variations in Pleurage 
curvicolla (Wint.) Kuntze, 406 
Yampolsky, Cecil. Inheritance of sex in 
Mercurialis annui, 410 
YouNGKEN, Heber W. Notes on the 
dasheen and chayote, 380 
Zea Mays, plastids and mitochondria in, 
217; germination and further develop- 
ment of embryo of, when separated from 
the endosperm, 443 
Zinc, stimulation of the growth of Asper- 
gillus by. 330, 357 
