TABLE OF CONTENTS, VOLUME VII, 1920 
No. I, January 
Page 
The injections of chemicals into chestnut trees (with seven text figures). 
Caroline Rumbold i 
The occurrence and inheritance of sex intergradation in plants 
Cecil Yampolsky 21 
An apparatus for automatically changing the temperature of a chamber 
(with Plates I and II) George F. Potter 39 
No. 2, February 
Effect on chestnuts of substances injected into their trunks (with 
Plates III and IV) Caroline Rumbold 45 
Subalpine lake-shore vegetation in north-central Colorado (with six 
text figures) Francis Ramaley 57 
Some observations on the spore discharge of Pleurage curvicolla (Wint.) 
Kuntze J. L. Weimer 75 
Correlation between size of the fruit and the resistance of the tomato 
skin to puncture and its relation to infection with Macrosporium 
tomato Cooke J. Rosenbaum and Charles E. Sando 78 
No. 3, March 
The length of the life cycle of a climbing bamboo. A striking case of 
sexual periodicity in Chusquea abietifolia Griseb. (with five text 
figures) William Seifriz 83 
Sex intergradation in the flowers of Mercurialis annua (with Plate V) 
Cecil Yampolsky 95 
The upward translocation of foods in woody plants. I. Tissues con- 
cerned in translocation (with four text figures) Otis F. Curtis ioi 
No. 4, April 
Embryo development and polyembryony in relation to the phylogeny of 
conifers (with 89 text figures) John T. Buchholz 125 
The living cycads and the phylogeny of seed plants (with Plate VI) 
Charles J. Chamberlain 146 
Distribution and relationship of the cycadeoids (with five text figures 
and Plate VII) G. R. Wieland 154 
iii 
