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TABLE OF CONTENTS 



cumarin 



Comparative anatomy of dune plants. Contri- 

 butions from the Hull Botanical Laboratory 



Parnassia and some allied genera (with plates 



XIV-XVII) - 



Development of the microsporangia and micro- 

 spores of Abut Hon Theophrasti (with twelve 



figures) 



PAGE 



I 



31 



The development of the vascular structure of 



Dianthera americana (with plates I-IV) - W 



The toxic action of organic compounds as modified 

 by fertilizer salts (with five figures) 



Oswald Schreiner and 



The effect of external conditions upon the after- 

 ripening of the seeds of Crataegus mollis. Con- 

 tributions from the Hull Botanical Laboratory 



157 - W timer E. Davis and R. Catlin Rose 49 



The structure of the stomata of certain Cretaceous 



conifers (with plates V and VI) - - - W. P. Thompson 63 

 Spermatogenesis in Equisetum. Contributions 

 from the Hull Botanical Laboratory 158 



(with plates VII and VIII) - Lester W. Sharp 89 



The primary color-factors of Lychnis and color- 

 inhibitors of Papaver Rhoeas - - George Harrison Skull 1 20 



Contributions from the Rocky Mountain Her- 



■ 



barium XI (with two figures) - Aven Nelson 136 



Beneficial effect of creatinine and creatine on 



growth (with one figure) - /. /. Skinner 152 



The life history of Aneura pinguis. Contributions 



from the Hull Botanical Laboratory 159 (with 



plates IX-XII) 



Plant geography of North Central New Mexico. 



Contributions from the Hull Botanical Labora- 

 tory 160 (with seven figures) - /. R. Watson 194 

 The perfect stage of Actinonema rosae (with plate 



XIII) -------- Frederick A. Wolf 218 



Undescribed plants from Guatemala and other 



Central American Republics. XXXV - - John Donnell Smith 235 

 Influence of phosphate on the toxic action of 



Grace L. Clapp 177 



/. /. Skinner 245 



161 (with thirty-five figures) - Anna M. Starr 265 



Lula Pace 306 



V. Lantis 330 



v 



