OONTENTS. XVli 



PAGE 



Position of Leaves in respect to Light ., „ ., ., Part 3 386 



Photepinasty of Leaves „ 386 



Movements of Leaves and Fruits „ 386 



Distribution of Water in the Heliotropio Parts of Plants . , „ 387 



Excretion of Water from Leaves „ 387 



Movements of Water in Plants „ 387 



Permeability of Wood to Water ^ „ 389 



Trichomatic Origin and Formation of some Cystoliths .. „ 389 



Formation of Starch out of Sugar . . . . „ 389 



ListribvXion of Energy in the Chlorophyll-spectrum .. ., „ 390 



Colour and Assimilation „ 390 



Occurrence of Allantoin and Asparagin in Young Leaves . . „ 391 



Cholesterin, Phytosterin, Paracholesterin, ^c, .. .. .< „ 391 



Respiration of Submerged Parts of Plants „ 391 



Freezing of Liquids in Living Vegetable Tissue „ 391 



Influence of Electricity on Vegetation „ 392 



Continuity of Protoplasm through the Walls of Cells .. .. Part 4 524 



Pollination of EuUngia „ 525 



Development of Chlorophyll-grains and Pigment-bodies .. „ 525 

 Effect of Tension of the Bark on the Formation of th-e 

 Annual Pings of Wood, and on the Direction of the 



Medullary Bays „ 527 



Formation and Properties of Duramen „ 527 



Polarization-phenomena of Vegetable and Artificial Colloid- 

 cells „ 528 



Origin of " Cell-passages" .. „ 529 



Collenchyma „ 529 



Structure of the Pericarp of Orchidece „ 530 



Chemistry of Woody Tissues , 530 



First Products /)f Assimilation ., ., ,. ,. .. .. „ 530 



Selective Power of Absorption of Boots „ 530 



Movements of Water in Plants „ 531 



Movements of Water in the Vessels ,. ., „ 531 



Exudation of Water from Leaves „ 531 



Hypoxanthin in the Potato , 532 



Function of Tannin in Metastasis „ 532 



Laws which regulate the Production of Male and Female 



Flowers „ 532 



Selenotropism of Plants ,, 534 



Withering of Flowers and Leafy Shoots „ 534 



Fatty Acids in Plants ,, 535 



Influence of Mineral Substances on Germination ,, .. „ 535 



Occurrence of Iron in Plants „ 536 



Morphology of the Embryo Part 5 675 



Cellulin, a modification of Cellulose . . „ 676 



Protrusion of the Endosperm through the Micropyle .. . , „ 677 



Development of the Pollen of Juncacece and Cyperacece . , „ 677 



Continuity of Protoplasm through Walls of Vegetable Cells „ 677 



Pores in the Outer Walls of Epidermal Cells „ 678 



Physiology of the Undulations of the Lateral Walls of the 



Epidermis „ 678 



Structure and Function of the Epidermal Tissue ., .. „ 679 



Ser. 2.— Vol. III. h 



