TABLE OF CONTENTS 
A conspectus of Mexican, West Indian, Central and 
South American species and varieties of Salix - Camillo Schneider 
Algae of the Hawaiian Archipelago. I- - - Vaughan MacCaughey 
Western plant studies. V- - - - - Aven Nelson and 
J. Francis Macbride 
Notes on osmotic experiments with marine algae - Rodney H. True 
Independent evolution of vessels in Gnetales and 
Angiosperms (with eleven figures) - - - - W.P. Thompson 
A columella in Marchantia polymorpha (with plates I, 
II) ee er eer tee eek teed ee er J. E. Cribbs 
Apogamy in the Cyatheaceae (with ten figures) - - Alma G. Stokey 
Algae of the Hawaiian Archipelago. II - - Vaughan MacCaughey 
Chemical basis of correlation. I. Production of equal 
masses of shoots by equal masses of sister leaves 
in Bryophyllum calycinum (with eighteen figures) Jacques Loeb 
Abnormalities in Nicotiana (with ten figures) -  - H. A. Allard 
Changing diatoms of Devils Lake - - - - - C. J. Elmore 
Sexuality in Rhizina undulata Fries (with plates III, 
Iv) - <b oe ae ed 8 ee es BEM, Beleboich 
Some Meliolicolous parasites and commensals from 
orto Rico (with plates V, VI, and five figures) F. L. Stevens 
Anatomy of certain goldenrods sates — VII, 
VIII, and one figure) - - - - - Edith S. Whitaker 
Pelea and Platydesma (with one figure)- - - - Joseph F. Rock 
Secretory canals of Rhus diversiloba - - = = James B. McNair 
Carduaceous species of Puccinia. I. en occur- 
ring on the tribe Vernoniae = - H.S. Jackson 
The ray _ of SD aahie alba ssaaed cyanea 
figures) 
gures - - LaDema M. Langdon 
Bearing of heterosis upon double fertilization aes 
three figures) - - - Donald F. Jones 
Vv 
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