xviii 



Classification of the Principal Organic Products 367 



Products free from Nitrogen ' ^ 



Carbohydrates 360 



Vegetable Acids 3QQ 



Fats, or Glycerides 861 



Certain Astringents [ y 



Glucosides ' ggg 



Ethereal Oils. . 



Resins and Balsams 



Products containing Nitrogen 



Albumin-like Matters ' 2M. 



Asparagin 



Alkaloids 



Unorganized Ferments 



RESPIRATION 



Measurement of Respiration * 



Plants in Dwelling-houses L_ 



Relations of the Carbonic Acid given off in Respiration to the Oxy- 

 gen absorbed 



Influence of Temperature and Light upon Respiratiou 



Resting State 



Respiration accompanied by an Evolution of Heat 370 



Intramolecular Respiration 87 



CHAPTER XII. 



VEGETABLE GROWTH. 



Nature of Growth 373 



Cell-division 374 



In the Development of Stomata . , 376 



In Cambium 377 



In the Development of Pollen-grains 379 



In Plant-hairs 380 



Directions in which the new Cell-wall may be laid down 380 



Growth of the Cell-wall 382 



Measurement of Growth 383 



Conditions necessary for Growth 384 



Relations of Growth to Temperature 386 



To Light 887 



To Supply of Oxygen 888 



Periodical Changes in the Rate of Growth 889 



Properties of New Cells and Tissues 889 



Tensions in the Cell-wall 390 



Tension of Tissues 890 



Geotropism 892 



Heliotropism 892 



Hydrotropism ,398 



