vi CONTENTS [VOLUME XLVI 
Notes on numerical variation in the daisy = J ee Eaeforile 
The vascular anatomy of the seedling of Dioon edule. 
Contributions from the Hull Botanical Labora- 
tory CXIX (with plates XXITI-XXIX) - Reinhardt Thiessen 
Bryological papers: II. The origin of the nigule 
of Marchantia. Contributions from the Hull 
Botanical eee CXX (with fourteen 
fi ) -  - Charles R. Barnes and W.J.G. Land 
Emergence of lateral roots (with three figures) -  - Raymond H. Pond 
Studies in the Gramineae: IX. The Gramineae of 
the alpine region of the Rocky Mountains in 
Colorado (with five figures and plate XXX) Theo. Holm 
The nature of the embryo sac of Peperomia (with 
plates XAMI-XAXUD) +. +. <3 ee gy . Brown 
BRIEFER ARTICLES— 
The occurrence and rate of ee stream- 
ing in greenhouse plants - Grace L. Bushee 
On plasmolysis . - W. J. V. Osterhout 
The flowers of Washingtonia (with hive feces: S. B. Parish 
The number and size of the stomata - - - Sophia H. Eckerson 
The absorptive pve of a cultivated soil (with 
three figures) - Joseph a and Charles Heller 
A parasitic alga, Rocky Set ota 
Lagerheim, in North Ameri - George F. Atkinson 
Note on balanced solutions - Oscar Loew 
Formation of adventitious roots in the ealicils 
tree (with two figures) - O. M. Ball 
New —— — of Crataegus (vith two 
- Francis Ramaley 
Sexual conse in Fepautl - co A. F. Blakeslee 
A new characteristic of Engelmann ae - E. R. Hodson 
A new poisonous mushroom - - George F. Atkinson 
Affinities of Phyllocladus. Contcibatioans from 
the Hull Botanical Laboratory CXXI - -N. Johanna Kildahl 
Note on the pollen of oe - Robert Boyd Thomson 
CurRENT LITERATURE - - 
For titles of books reviewed see eae adie 
author’s name and Reviews 
Papers noticed in “Notes for Students” are 
indexed under author’s name and oo 
DATES OF PUBL PUBLICATION 
349 
56, 148, 230, 305, 387, 467 
No. 1, July 23; No. 2, August 22; No. 3, September 22; No. 4, October 175 
bs : 
No. 5, November 16; No. 6, Decenibes 
