XIV CONTENTS 



CHAPTER XI 



STORAGE OF FOOD AND WATER 



PAGE 



Need of Food Storage. The Kinds of Stored Food. The 

 Process of Storage. Location and Extent of Food 

 Storage Tissues. Fluctuations in the Solubility and 

 Insolubility of Stored Food. Digestion of Stored Food. 

 Assimilation of Food. Relation of Stored Food to 

 Energy Supply. The Storage of Water. Character- 

 istics -of Water Storage Tissues. Illustrative Studies. . 175198 



CHAPTER XII 



SECRETION AND EXCRETION 



Nature of Secretions and Excretions. Secreting Cells and 

 Glands in General. Laticiferous Vessels or Milk Tubes. 

 -Tannin Cells. Special Enzyme-secreting Cells. 

 Secretion and Excretion of Minerals. The Process of 

 Secretion. The Excretion of Liquid W T ater. Illustra- 

 tive Studies 199212 



CHAPTER XIII 

 REPRODUCTION 



Development of Fern Sporangium. Division of Spore 

 Grandmother Cells. Germination of the Spores. 

 Fertilization of the Egg. Interpretation of the Processes 

 of Nuclear Division. Two Generations in the Life- 

 cycle. Spore Formation in Spermatophytes. Forma- 

 tion of the Microspores. Details of Nuclear Division. 

 Formation of the Megaspores. Details in Division of 

 Megaspore Grandmother Cell. Germination of the 

 Megaspore. Fertilization and Germination of the Egg. 

 -The Triple-fusion Nucleus. Behavior of Pedigree 

 Hybrids. Interpretation of Mendel's Results. Pater- 

 nal and Maternal Chromosomes. Bearers of Hereditary 



