﻿TABLE OF CONTENTS 



The action of Schumann rays on living organisms 



(with four figures) ------- W. T. Bovie i 



Western plant studies. Ill - - Avert Nelson and /. Francis Macbride 30 

 A Mexican Aytonia. Contributions from the Hull 



Botanical Laboratory 211 (with plates I-IV 



and four figures) ------- Anna M.Starr 48 



Notes on succession from pine to oak - - - Barrington Moore 59 



The pathology of ornamental plants - - - - Mel. T. Cook 67 



Origin and development of the lamellae in Coprinus 



(with plates V-XII and six diagrams) - - Geo. F. Atkinson 89 



On the germination of the pollen grains of apple 



and other fruit trees ------ /. Adams 131 



The decrease of permeability produced by anes- 

 thetics (with six figures) ----- W.J. V.Osterhout 148 



On pairs of species (with twelve figures) - - Reginald Ruggles Gates 177 



Abscission in Mirabilis jalapa (with plate XIII 



and two figures)- ------- Francis E. Lloyd 213 



The development of the conceptacle in Fucks. 

 Contributions from the Hull Botanical Lab- 

 oratory 212 (with plates XIV-XVII)- - - Mabel Lewis Roe 231 



A new method of separating fungi from protozoa 



and bacteria Nicholas Kopelojf, H. Clay Lint, and David A . Coleman 247 



Biochemical and physiological study of the rest 

 period in the tubers of Solanum tuberosum 



(with two figures) ------- Charles O. A ppleman 265 



Decay and soil toxins. Contributions from the 



Hull Botanical Laboratory 213 - - - - George B. Rigg 295 



Nuclear division of Spirogyra. II. Nuclear divi- 

 sion in 5. bcllis (with plates XVIII-XX) - - Mabel L. Merriman 31 1 



The embryo sac of Richardia ajricana Kth. (with 



plates XXI-XXIII) ------ Margaret R. MicheU 325 



Botanical Laboratory 214 (with plates XXIV- 



XXVI and one figure) ----- Charles J . Chamberlain 353 



