

TABLE OF CONTENTS 



Oenothera Lamarckiana mut. velutina (with plate I) Hugo DeVries 



Influence of the leaf upon root formation and 

 geotropic curvature in the stem of Bryophyllum 

 calycinum and the possibility of a hormone 

 theory of these processes (with thirty figures) Jacques Loeb 



Prothallia and sporelings of three New Zealand 

 species of Lycopodium. Contributions from 

 the Hull Botanical Laboratory 222 (with 

 plates II and III) ------ Charles 7. Chamberlain 



Prothallia of Lycopodium in America. Contribu- 

 tions from the Hull Botanical Laboratory 223 

 (with twenty-one figures) ----- Earle A . Spessard 



Similarity in the effects of potassium cyanide and 

 of ether (with one figure) - 



A comparative study of winter and summer leaves 

 of various herbs. Contributions from the Hull 



W. J- V. Osterhout 



Botanical Laboratory 224 



7. P. Stober 



Imperfection of pollen and mutability in the genus 

 Rosa (with plates IV- VI) - 



Morphology of Keteleeria Fortunei. Contributions 

 from the Hull Botanical Laboratory 225 (with 

 plates VII and VIII and three figures) 



The pollination of Vallisneria spiralis (with plate 



IX and six figures) 



Tolerance of fresh water by marine plants and its 

 relation to adaptation ------ 



Temperature and life duration of seeds. Contribu- 

 tions from the Hull Botanical Laboratory 226 



(with five figures) 



A report on some allocthonous peat deposits of 

 Florida. Part II: Morphological (with plates 



X and XI) 



The response of plants to illuminating gas. Con- 

 tributions from the Hull Botanical Laboratory 



227 (with six figures) 



PAGE 



I 



25 



51 



66 



77 



89 



Ruth D. Cole no 



A. H. Hutchinson 124 



Robert B. Wylie 135 



W. J. V. Osterhout 146 



James F. Groves 169 



Carl C. Forsaitk 190 



Sarah L. Doubt 209 



