vi CONTENTS [VOLUME XXXVIII 
PAGE 
The variation of some California agate te nine fig- 
ures) - Edwin Bingham Copeland 401 
Klinostats and secacihinss for ey siological research 
(with three figures) - - Frederick C. Newcombe 427 
Ecological notes on the trees of the hit Garden 
at Naples (with four figures) - . Grace E. Cooley 435 
Relative transpiration of old and new eee of = 
Tyrtus type - - Joseph Y. Bergen 446 
Regeneration in Zamia. een from the Hull 
Botanical caauicna LXV (with eight fig- 
ures) - - - John M. Coulter and M. A. Chrysler 452 
BRIEFER ARTICLES— 
The aecidium of maize rust - - J.C. Arthur 64 
An experiment on the relation of soil fe sics to 
plant growth. Contributions from the Hull 
Botanical Laboratory. LX (with three fig- 
ures) - “ Burton E. ape and Gerhard H. Jensen 67 
Anew Gilia -— - . : Alice Eastwood 471 
Notes on North Adie aa III and 
Ive = - - A. S. Hitchcock 139, 297 
Carl Schrabia vt porte) a eee Janet Perkins 143 
A correction - - - Charles J. Chamberlain 145 
Artificial para a faints notice. = - George J. Peirce 214 
The growth of Ramalina reticulata Runa 
(with one figure) - Albert C. Herre 218 
Oogenesis and fertilization in Aduse I pomoeae: 
panduranae (with two figures) - F. L. Stevens 300 . 
A new sheep poison from Mexico - -_ - B. L. Robinson 376 
Some western species of Agropyron - Elias Nelson 378 
Note British Columbian dwarf trees 
(with three figures) - Conway MacMillan 379 
Celloidin technique: a Aan E. C. J oh, c bhuirkes J.C. pa 381 
An abnormal Ambrosia (with three figures) - .C. Life 383 
New or babes —s from southern Cali- 
fornia - S.B. Parish 459 
CURRENT LITERATURE - - = 73, 146, 220, 303, 385, 463 
For titles see index aus ee name and 
Reviews. Papers noticed in “Notes for 
students” are indexed under author’s name 
and subjects. 
News 2 - - - - - - - 79, 160, 239, 318, 399 480 
Oy sn abl iN DE ati 5 
