vi CONTENTS 
ATKINSON, GEORGE F. Six misunderstood species of Amanita.. 246 
DopcE, B. O., and Apams, J. Е. Some observations оп the de- 
velopment of Peridermium Cerebrum (with plates 4—6). 253 
HARPER, RoLAND М. The vegetation of the Hempstead Pies 
CR Mt а ес т ао тън 262 
STEINBERG, R. A. A study of some factors influencing the stimu- 
lative action of zinc sulphate on the growth of Aspergillus 
niger. 1. Тһе effect of the presence of zinc in the cultural flasks 287 
MEDSGER, OLIVER Р. Two months in the southern Catskills.... 294 
BURLINGHAM, GERTRUDE S. A preliminary report on the Russu- 
ааа Жы ИСА е SICUT Aue ыы 301 
Harris, J. Автнгя. Оп the osmotic concentration of the tissue 
fluids of desert Loranthaceae. естен мыт UPS 307 
Мите, Ortanp E. Inheritance studies in Pisum. IIT. The 
Ишен СЕ of o 12k RS сл. Шз гг: ину. 316 
GRAHAM, MARGARET. Centrosomes during early fertilization 
stages in Preissia quadrata (with plate 8)................... 323 
Apams, J. Е. Origin and development of the lamellae in Schizo- 
phyllum commune (with plate 9)........................... 326 
SrouT, А. B., and Boas, HELENE M. Statistical studies of flower 
number per head in Cichorium Intybus: kinds of variability, 
heredity, and effects of selection (with plates 10-13). ....... 334 
Hazen, Tracy E. The trimorphism and insect visitors cf Pon- 
жене Cu ПЕНЕТА ап INI зул... му ту гр... 459 
