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4 
TABLE OF CONTENTS. 
GE 
PA 
On the origin and nature of the middle lamella - - - Charles E. Allen I 
Structural studies on southwestern Cactaceae (with nine 
figures) - - - - - - Carleton EL. Preston 35 
Gametogenesis and fertilization in Albugo. Contributions 
from the Hull Botanical hecsespaty eS XXIX (with 
plates I-Iv) - Frank L. Stevens 77, 157, 238 
The ecological relations of the vegetation of western Texas, 
Contributions from the Hull Botanical makin 
XX (with twenty-four text figures) - William L. Bray, 99, 195, 262 
A study of the sporangia a gametophytes of Selaginella 
apus and agatts a Tupestris. Contributions from 
he Hull Bot iL Botanical Laboratory. XX 
x 
(with plates cee - - - - - - Florence M. Lyon 124, 170 
The application of normal solutions to biological problems James B. Dandeno 229 
Further notes on the physiology -E polymorphism in green 
algae. Contributions from the Hull Botanical Labo- 
ratory. XXXII - - Burton Edward Livingston 292 
New or little known unicellular algae. II. Eremosphaera 
viridis and Excentrosphaera (with plates x—x11) George Thomas Moore 309 
Development of the pollen in some Asclepiadaceae on- 
tributions from the Hull Botanical erie rat we 
XX XIII (with plate x1) - - iC, Prye 325 
On the distribution of red color in vegetative parts in the New 
England flora - - - - : - - - F. Grace Smith 332 
Some plant abnormalities (with thirty-six figures) - George Harrison Shull 343 
The anatomy of the O d (with plates x1v—xvir) J. A. Faull 381 
BRIEFER ARTICLES— 
Note on Basilima and Schizonotus of Rafinesque - Alfred Rehder 56 
Potamogeton polygonifolius in Newfoundland, - - Arthur Bennett 58 
A new Sphaeralcea - - - - - - - 7. D.A. Cockerell 60 
The probabie function of calcium oxalate Pac saene in 
plants - - - Albert Schneider 142 
Notes of travel. VII - - - - - - David G. Fairchild 218 
Intramolecular respiration - - - - - T. C. Johnson 303 
ee 
