Pa 
Vol. 43 No. 1 
BULLETIN 
TORREY BOTANICAL CLUB 
JANUARY, 1916 
Physiological observations on Drosera rotundifolia * 
HENRY D. HOOKER, Jr. 
(WITH ELEVEN TEXT FIGURES) 
CONTENTS 
PAGE 
¥ SOR OTTIOTION ee i a ne iG Pca b ces es bebe ane 
ie ATRIAL es Ge eee i ny eos oe bac NK VR Ree ee oe oe CWE bes 2 
2) PIGMENT. lai sa oe wee abe ea Nee SC Uipeen Uy gain ea dh sg + Sa Saw OS 2 
We PUA EE hk an oe cay oe WO ad APE Ey ecard sa ee 8g oeie leh ewe 4 
iy RM AMERNG 6k bsp co sso oe 5 Fiend eer Soy yale + OA n Seas «v8 ee ae Fe at ey Emin 4 
PENA TONION i ek ac lee ees wnt Be 5 
7 ro St pte eA say i age mee eae ak, Sal een a I ee ade ee ree he 5 
(@) NORMAL DEVELOPMENT. 605. e eee cette nese enw nee es 5 
Ch) TERUREMEAL, BETO oo ee ee ea ve reese eee eens 6 
Coy BLKPRRIMIENTAL, TOATA i aoe Ee Nhe ea et ae ee er eee eens q 
(2) DNCOMRION: 6 eR i i A eI sce eee ae 19 
i Bending: ee eo re a Ue ee iol ce Wietie ba Bee oe 19 
ah Ur ee Pies ia deta es 21 
iii, Growth “a Turgidity..... ee re ess eed eee ON et 22 
1G. CORI rs ei LE SS ORS CaO SE 23 
ow. Second and. ( Wrd Rtccioes:: 3 3) foe 66 ee i SS 23 
eis BELG TRA ACO Es hs es 5 he i i os Re a wi a wale ke Re 24 
vii. D J LO TEES GE PEN ORNS UA SEDC DES ee Ae earner 25 
Me Re ee ok ee ed eb ee he bk s Crh pea E ees eee anes 26 
1. INTRODUCTION 
The object of the work, which this paper presents, was to 
determine whether the bending of Drosera tentacles was connected 
with a temporary acceleration of the rate of growth or with 
differences of turgidity; in physiological terms, whether the bend- 
* Contribution from the Osborn Botanical Laboratory. 
[The BuLLETIN for December (42: 651-698. pl. 30~33) was issued January. 20, 1916.] 
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