vi CONTENTS [VOLUME LXxII 
Polypodium vulgare as an epiphyte (with three 
figures)- - - = - = = = = = = Duncan S. Johnson 
Chromosomes of Sse at conicum (with 
plates IV, V)- - - - - = = Amos M. Showalter 
Peach yellows and little peach (with plates VI, VII) Mel. T. Cook 
Effect of location of seed upon germination- - — Edward N. Munns 
Decay of Brazil nuts Silo Lorne VITI-XIT and 
three figures) - - - - - - Edwin Rollin Spencer 
Growth rings in a monocotyl. Contributions from 
' the Hull Botanical ye 285 Ae six- 
teen figures) - - - - C.J. Chamberlain 
Invasion of virgin soil in the tropics (with two 
figures)- - - - - = = - = = - - Duncan S. Johnson 
Pectic material in root hairs. Contributions from 
the Hull Botanical Laboratory 286 - - - Caroline G. Howe 
Destruction of mosses by lichens. Contributions 
from the Hull Botanical y sutaliais 287 sie 
plate XIII) - - - ee - Frank P. McWhorter 
Annual rings of apene: in carboniferous wood (with 
plate XIV) - - - - - - - Winifred Goldring 
Optimum temperatures for flower seed germination 
(with ten figures)- - - - - - - - = Geo. T. Harrington 
Reaoeuinan organs of bog plants. Contributions 
m the Hull Botanical —— 288 aa 
cian figures) - - - - Se Fred W. Emerson 
Morphological study of Carya alba and Juglans 
nigra (with plates XV, XVI, and one figure) - Theo. Holm 
Phylogenetic position of the bacteria - Hilda Hempl Heller 
Odontopteris genuina in Rhode Island with ‘Eve 
figures) - - Eda M. Round 
BRIEFER ARTICLES— 
Helmut Bruchmann (with portrait) -  - C. J. Chamberlain 
Root caistaareaies of wheat ein ane” vith one 
figure - W. F. Gericke 
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