CONTENTS. XIX 



Development of Boot-hairs .. . . . . . . Part 3 409 



Symmetry of Adventitious Hoots 5» 409 



Penetration of branches of th'e Blackberry into the Soil .. „ 410 



Circumnutation and Twining of Stems .. .... .. ,, 410 



Vegetable Acids and their Effect in Producing Turgidity .. „ 410 



Metastasis and Transformation of Energy in Plants . . . . „ 411 



Action of the different Bays of Light on the Elimination of 



Oxygen > 4:11 



Movements caused by Chemical Agents „ 412 



Direct Observation of the Movement of Water in Plants .. „ 413 



Rheotropism » 413 



Transpiration-Current in Woody Plants „ 414 



Origin and Morphology of Chlorophyll-corpuscles and Allied 



Bodies •• » 415 



Spectrum of Chlorophyll „ 415 



Portion of the Spectrum that Decomposes Carbon Dioxide „ 415 



Chlorophyll in Cuscuta .. .. .. •■ „ 415 



Work Perfortned by Chlorophyll .. .. „ 415 



Sphwrocrystals •• ,. 416 



Sphcerocrystals of Paspalum elegans » 416 



Calcium Oxalate in Bark ,, 416 



Homology of the Beproductive Organs in Phanerogams and 



Vascular Cryptogams Part 4 581 



Influence of Light and Heat on the Germination of Seeds . . „ 583 



Origin of the Placenta in the Alsinece (^Caryophyllece) .. ,, 583 



Gemmce of Aulacomnion palustre ,, 584 



Belation between Increase and Segmentation of Cells .. ,, „ 584- 

 Development of Starch-grains in the Laticiferous Cells of 



the EuphorbiacecB „ 584 



Constitution of Chlorophyll .. „ 584 



Cellulose accompanying the Formation of Crystals , . . . „ 585 



Middle Lamella of the Cell-wall „ 585 



Intercellular Spaces between the Epidermal Cells of Petals „ 586 



Contents of Sieve-tubes .. .. „ 586 



Organs of Secretion in the Hypericacece . . . . . . . . „ 586 



Tracheids of Gymnosperms „ 587 



Apparatus in Leaves for Beflecting Light „ 587 



Swellings in the Boots of Papilionacece „ 588 



Origin of Adventitious Roots in Dicotyledons „ 588 



Crystals of Silex in the Vascular Bundles „ 588 



Effect of Heat on the Growth of Plants ,, 588 



Curvature of Boots „ 589 



Torsion as a Cause of the Diurnal Position of Foliar Organs „ 589 



Assimilative Power of Leaves „ 589 



Quantitative Belation between Absorption of Light and 



Assimilation ,» 590 



Causes which Modify the Direct Action of Light on Leaves „ 590 



Respiration of Leaves in Darkness „ 591 



Movements of the Sap in the Boot-tubers of the Dahlia .. „ 591 



Absorption of Water by the Capitulum of Composltae . . „ 59 1 



Measurement of Turgidity ,, 592 



h 2 



