: CONTENTS 
The blige cine of the spores of oe sygo- 
ora (with plate XIX) - 
ce on Ginkgo biloba (with plate XX) - - - 
The origin of the chloroplasts in the cotyledons 
[VOLUME LI 
I. M. Lewi. 
Walter W. Tupper 
PAGE 
of Helianthus annuus (with plate XXVI) - Edwin C. Miller 378 
Cell and nuclear division in sppeeen (with — 
XXII and XXIII and one figu B.F. Luiman 401 
The genus Evernia as represented in North ns 
Middle America - R. Heber Howe, Jr. 431 
Imbedded sexual cells in the Polypodiacen ‘(with 
plates XXVI and XXVII) Margaret C. Ferguson 443 
An American Lepidostrobus. Contribution. from 
the Hull Botanical Laboratory 144 (with 
plates XXVIII and XXIX) John M. Coulter andW.J.G. Land 450 
Suggestions concerning the terminology of soil 
bacteria - - - - - - - Jacob G. Lipman 454 
BRIEFER ARTICLES— 
Ergot on oats (with one figure) - - - C.W.Warburton 64 
Melchior Treub (with portrait) - - John M. Coulter 141 
David Pearce Penhallow (with portra a - - Edward C. Jeffrey 142 
Notes on Funaria Hebi oplere ~— ve 
figures) Jennie M. Speer 225 
A portable, sdtst able camera Sead (with 
three figures) - Harry B. Shaw 227 
joo conjugation in Rhizopus ek 
- Florence A. McCormick 228 
Pistillody = stamens in acu nein Alfred Rehder 230 
A convenient microtome knife osiuies five — 
gures - - Charles J. Chamberlain 208 
Aditieas to the grasses ro Cuba - - A.S. Hitchcock 300 
Two sprouting conifers of the Southwest 
(with four res F.J. Phillips 385 
Cell division in Sebo 5 cellniniars ‘tote) William H. Brown 390 
Note concerning the discovery of the nucleus W. Marquette 461 
Nuclear phenomena in Puccinia podophylli Lester W. Sharp 463 
CURRENT LITERATURE - - 65, 145, 232, 303, 392, 465 
For titles of book reviews see coe under 
author’s name and reviews 
Papers noticed in “Notes for Students” are 
indexed under author’s name and subjects 
DATES OF PUBLICATION 
No. 1, January 17; No. 2, February 16; No.3, Marchrs; No. 4, April 17; 
No. 5, May 17; No. 6, June 10. 
