The Botanical Gazette 
A Montbly Fournal Embracing all Departments of Botanical Science 
Edited by JOHN M. CouLTER and CHARLES R. BARNES, with the — of other members of the 
botanical staff of the University of Chic 
Vol. XLIII, No. 6 Issued June $7, 1907 
CONTENTS 
THE Seen OF TENSION ON oe FORMATION OF MECHANICAL TISSUE 
N PLANTS. Rufus Percival Hibba 361 
Se serry IN THE PRODUCTION OF THE SEXUAL CELLS OF D/C7'YOTA 
: DICHOTOMA. CONTRIBUTIONS FROM THE BOoraNICAL LABORATORY OF THE JOHNS 
DD. Ho 
B Hopkins Universiry, No. 6 (wiTH TWO CHARTS). W, yt : 383 
THF FUNCTION OF Se ae cae IN THE FORMATION OF CANE AND INVERT 
GAR DATES. A. £. Vinson 393 
? NEW OR ape subeingy NORTH AMERICAN CONVULVULACEAE iba FOUR 
i: FIGURES). Homer D. Hous - 408 
_ ~BRIEFER ARTICLES 
HETEROTHALLISM IN BREAD MOLD, Rhizopus nigricans. A. F. Blakeslee - - ae oe 
% Ferguson - Aer MNP eee soe Eo hes CLEP ale IO Rea CS 4 
Ee CURRENT LITERATURE 
BOOK RFVIEWS ‘ 3 3 : : ce ss ¢ E ; E - 420 
RECENT TEXTBOOKS. 
 _ NOTES FOR STUDENTS = F if ss ‘ a x ~ ’ & * 4 - 423 
wesw Ss . 
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ve Two EmsBryo-Sac MozHER CELLS IN Lilium iongiflorum (WITH ONE FIGURE), Margaret 
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