Xii CONTENTS 
CHAPTER II 
Life History of the Male Fern 
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. 
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. 
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. 
RESEMBLANCES BETWEEN GYMNOSPERMS AND ANGIO- 
SPERMS. 
FUNDAMENTAL DIFFERENCES BETWEEN GYMNOSPERMS 
AND ANGIOSPERMS. 
Pages 
33-44 
45-52 
. 53-58 
58 
58-59 
