TABLE OF CONTENTS 





Development of Cyathus fascicular is, C. striatus, 

 and Crucibulum vulgar e (with plates I- VI and 



Page 



three figures) 



Leva B.Walker 



Effect of unilateral monochromatic light and group 

 orientation on the polarity of germinating 

 Fucus spores (with two figures) - Annie May Hurd 25 



Crown-gall of alfalfa (with plates VII-X)- - - O.T. Wilson 51 



Geo-presentation and geo-reaction. Contributions 

 from the Hull Botanical Laboratory 268 (with 

 five figures) -------- 



Eva 0. Schley 69 



Studies in the genus Bidens. V. Contributions 

 from the Hull Botanical Laboratory 269 (with 



plates XI-XIV) 



Earl E. Sherfi 89 



Stem anatomy of Dioon spinulosum. Contribu- 

 tions from the Hull Botanical Laboratory 270 

 (with plates XV-X VII and four figures) - - LaDema M . Langdon no 



Auxographic measurement of swelling of biocolloids 



and of plants (with two figures) - D. T. MacDougal 1 26 



Hawaii's tapestry forests (with six figures) - -Vaughan MacCaughey 137 



Statocytes of the wheat haulm (with four figures) - F. L> Prankerd 148 



Xew species of Piper from Central America - - Casimir de Candolle 169 



Studies in evaporation and transpiration (with five 



figures) 



Geo. F. Freeman 190 ^ 



Early development of Inocybe (with plates 



XVIII-XXII) --.------ Gertrude E. Douglas 211 



Pectin relations of Sclerotinia cinerea - - J.J.Willaman 221 



Carbon monoxide a respiration product of Nereo- 



cystis Luetkana (with three figures) - Seth C. Langdon 



Physiological isolation by low temperature in 



and W. R. Galley 230 



Bryophyllum (with six figures) - CM 



W 



249 



v 



«H 



