TABLE*OF CONTENTS. 
PAGE 
The mechanism of root curvature (with figures), - - James B. Pollock I 
Studies in the development of the pollen grain in Sym 
locarpus foetidus and Peltandra, (with plates1 and 11), B. 4. Duggar 81+ 
A contribution to the life aaa of eee im plates 
) 
—x), - - William Dayton Merrell 99 
The haustoria of the Erysiphez Ge plates x1 and xII), _ - Grant Smith 153 
Studies on the geotropism of stems, - - - £dwin Bingham Copeland 185 
The structure and development of the sporophylls and 
sporangia of Isoetes (with plates x11I-xx), - R. Wilson Smith 225, 323 4 
Note on the structure and areca: of can as 
n (with plate xx1), - - Roland Thaxter 259 
cue of Uredinez in 1899, - - - J.C. Arthur 268 
The fertilization of Albugo candida (with plate xx11), Bradley Moore Davis 297 
Comparative study of the development of Trichurus 
spiralis and Stysanus stemonites (with plates xxIII 
and XXIV), - - - - - - - - Hl. Hasselbring 312 
Botrytis and Sclerotinia: their relation to certain plant diseases and to each 
other (with plates xxv—XXvVII and three figures), —- Ralph E. Smith 369 
A contribution to the life history of Quercus (with plates xxvil and xxix), 
Abram H. Conrad 408 - 
Flora of the White Lake region, Michigan, and its ecological relations (with 
map), x = a . - - - - - £. J. Hill 
419 
BRIEFER ARTICLES— 
Botanical bibliography, - - - . , : W.G. Farlow 64 
An important work on garden botany, - . Withelm Miller 134 
The Society for plop mrenOnes and 8 head Yale 
meeting, W. F. Ganong 135 
Cerastium arvense oblongifolium, - - -~— - £. J. Hill 141 
A new violet, - “ “ . . - - - Aven Nelson 143 
The nutation of Helianthus, - - . - - John H. Schaffner 197 
Pteris cretica in Illinois, - - - J. Schneck 201 
Origin of the thallus, alternation of © ear and the 
phylogeny of Cutleria, - . C. Sauvageau 277 
Vv [VOLUME XxIx 
