Xll CONTENTS 



CHAPTER II 



LIFE HISTORY OF THE MALE FERN 



. . PAGES 



HISTORY OF THE SPOROPHYTE OR ASEXUAL GENERATION. 



Gross structure of stem. Histology of mature stem. His- 

 tology of growing apex. Histology of mature root. Histology 

 of root apex. Continuity of crude sap flow. Histology of 

 stipe. Histology of lamina. Comparative physiology of 

 root, stem and leaf. Gross structure and histology of the 

 sori and sporangia. Rupture of sporangium and spore dis- 

 semination. HISTORY OF THE GAMETOPHYTE OR 

 SEXUAL GENERATION. Origin of new sporophyte or 

 diploid plant from fertilized egg. Growth of seedling into 



mature sporophyte. Alternation of generations 33~44 



% 



CHAPTER III 



LIFE HISTORY OF A GYMNOSPERM (PINUS STROBUS) 



DESCRIPTION OF THE WHITE PINE TREE (SPOROPHYTE). 

 Staminate cones. Carpellate cones. DESCRIPTION OF 

 THE GAMETOPHYTE GENERATION. The Male Game- 

 tophyte. The Female Gametophyte. Fertilization. Seed 

 Formation and Distribution. GERMINATION OF THE 

 SEED 45-52 



CHAPTER IV 



LIFE HISTORY OF AN ANGIOSPERM 



DESCRIPTION OF THE DOG'S TOOTH VIOLET. Development 

 of Female Gametophyte. Maturation of the Pollen Grain 

 and formation of the Male Gametophyte. Pollination and 

 Fertilization. Ripening of the Ovule to form the Seed and 

 of the Ovary to form the Fruit. Germination of the Seed and 

 development of the Mature Sporophyte 53~58 



RESEMBLANCES BETWEEN GYMNOSPERMS AND ANGIO- 



SPERMS 58 



FUNDAMENTAL DIFFERENCES BETWEEN GYMNOSPERMS 



AND ANGIOSPERMS. 58-59 



