VI CONTENTS. 



PAGE 



Tissues and systems. Epidermal system. Fundamental system. 

 Fibro-vascular system. Branches. Roots. Growth of the rhizome, 

 embryonic tissue, meristem. The apical cell. Aerial part. Structure 

 of the leaf. 64 



CHAPTER VI. 



THE BIOLOGY OF A PLANT (continued.) 



Reproduction. General discussion. Sporangia and spores. Germina- 

 tion of the spores. Origin of the Prothallium. Sexual organs. Germ- 

 cells. Fertilization. Growth of the embryo. Differentiation of the 

 tissues. Course of tlie fibro-vascular bundles. Apogamy. Apospory. 88 



General Physiology. The fern and the environment. Adaptation. Nutri- 

 tion. The income. Metabolism. The outgo. Respiration. Physiology 

 of the tissue-systems. Practical study of the fern. 102 



CHAPTER VII. 



THE BIOLOGY OF AN ANIMAL. THE COMMON EARTHWORM. 



Introductory. Mode of life, etc. General morphology. Antero-posterior 

 differentiation. Dorso-ventral differentiation. Bilateral symmetry. 

 Metamerism. Modifications of the somites. Plan of the body. Or- 

 gans and systems. 117 



Special morphology. Alimentary system. Circulatory system. Excretory 

 system. Respiration. Motor system. Nervous system. Nervous 

 action. Sensitive system. Systems of support, connection, protec- 

 tion, etc. 125 



CHAPTER VIII. 



THE BIOLOGY OF AN ANIMAL (continued.) 



Reproduction. Embryology. Germ-cells. Essential reproductive organs. 

 Accessory reproductive organs. Copulation. Egg-laying. Fertiliza- 

 tion. Cleavage of the fertilized ovum. Formation of the germ-layers. 

 Development of organs. Germ-layer theory. General characteristics 

 of development. 142 



CHAPTER IX. 



THE BIOLOGY OF AN 



Microscopic structure. Histiology. Principal tissues. Arrangement of the 

 tissues. Structure of body-wall. Alimentary wall. Blood-vessels. 

 Dissepiments. Nervous system. 155 



