’ THE Lan oa 
OTANICAL GAZETTE 
December 1909 
Editors: JOHN M. COULTER and CHARLES R. BARNES. 
‘CONTENTS Sa 41) oe ares 
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2 Dioon spinulosum ee * so Ne ies th hares J. ‘Chamberlain . : 
oS The Infuence of Gravity on | the Direction of Growth Of 22 f-: 
‘ ‘ © Fe ie 
Dd ~§ ae 
The Williamsonias of the My xtece Alta ue : a cf . rs R. Wieland - ae YY : 
“Sap Pressure in the Birch Stem i Ze E Merwin and Howard a Lyon 
ra "Briefer Atddlés: CEP SEC ES ess ee ta ese e 
Concavity of Leaves and Ittumination- ea 
Roezl and the Type of Washingtonia y Pees 
Longevity of See Ps LRP ie bes 
Rejginddr’ £52 5 Pes O39 Ss geese 
ee S| rs 44:82 Ae ee 
Current Literature $3 - ge ; nig Sy 7 : 
s The Universi sity of C Chicago Press dhe pres 
eR inat _wittiam: Werley Haat fm, Landon 2 po Ce BAL EO: 
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