TABLE OF CONTENTS. 
Undescribed plants from Guatemala and other Cen- 
tral American republics. XXVII - = John Donnell Smith 
The development of root hairs. Contributions from 
the Hull Botanical Laboratory. LXXIV = 
plate I and six figures) -  - Laetitia Morris Snow 
A contribution to the life history of A pocynum andro- 
saemtfolium (with plate IT) 
© 
Theodore C. Frye and Eleanor B. Blodgett 
Contributions from the Rocky Mountain Herbarium. 
VI - - ete ate, Ree | ve Aven Nelson 
SS in Pallavicinia. Contributions from 
e Hull Botanical Laborato ay. LXXV Pai h 
au IIT and IV) - - Andrew C. Moore 
Regeneration in plants. I. Contributions from 
the Hull Botanical meaen es LXXVI (with 
fourteen figures) - - William B. McCallum 
On proteolytic enzymes. II - - - Arthur L. Dean 
Contributions to the es of rhizobia. IV (with 
three figures)  - — Albert Schneider 
Two conidia-bearing fungi (with dan VD oo A. F. Blakeslee 
The development of the a chromosomes in 
pollen mother-cells  - - _ D. M. Mottier 
Relation of transpiration to growth in wheat. Con- 
tributions from the Hull Botanical Laboratory. 
LXXVII (with twenty-one figures) - - Burton E. Livingston 
Rusts on Compositae from Mexico - - -~ -~ J.C. Arthur 
A morphological study of Ulmus americana. Con- 
tributions from the Hull Botanical Laboratory. 
LXXVIII (with plates VII-IX) me Charles H. Shattuck 
Regeneration in plants. II. Contributions from the 
Hull Botanical Laboratory. LXXIX (with nine 
figures) - - - = . William B. McCallum 
A botanical survey of the Hwee River eT Til 
(with map and five figures) —- - Forrest B. H. Brown 
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