TABLE OF CONTENTS 



Oenothera rubrinervis, a half mutant - - - - 



Notes on American willows. III. A conspectus of 

 American species and varieties of sections Reticu- 

 latae, Herbaceae, Ovalifoliae, and Glaucae 



Morphology of the genus Actinomyces. I - - 



Protomarattia, a new genus of Marattiaceae, and 

 Archangiopicris (with plate I and three figures) - 



Bhster canker of apple trees; a physiological and 

 chemical study. Contributions from the Hull 

 Botanical Laboratory 246 (with ten figures) - 



Morphology of the genus Actinomyces. II (with 

 plates II-IX) ------- 



Relation of minimum moisture content of subsoil of 



prairies to hygroscopic coefficient - - F.J. Alway, 



G. R. McDole, and R. S. Trumbull 185 



Notes on North American trees. IV - - - C. S. Sargent 208 



Possible correlations concerning position of seeds in 



the pod -------- Byron D. Hoisted 243 



Embryo and seedling of Dioon spinulosum (with 



plates X, XI) ----- Sister Helen Angela Dorety 251 



Development of Stropharia epimyces (with ten 



figures) - - - - - - - - W. B. McDougall 258 



After-ripening and germination of seeds of Tilia, 

 Samhucus, and Rubiis. Contributions from the 

 Hull Botanical Laboratory 247 - - - - R. C. Rose 281 



Notes on American willows. IV. Species and varie- 

 ties of section Longifoliae ----- Camillo Schneider 309 



Respiration after death (with three figures) - - A. R. C. Haas 347 



Effect of anesthetics upon respiration (with seven 



figures) - - - A. R.C. Haas 377 



