ANALYSIS OF CONTENTS. 



XI 



PAGE 



protoplasm relatively but not absolutely stable. Do ex- 

 trinsic factors affect germinal protoplasm ? Diminished 

 nutrition. .. Changes in environment. Use and disuse. 

 Mechanical conditions. Results of impact. Value of 

 direct experiment. Return to the position of Darwin. 

 The final word still far distant. 



V. THE HEREDITY OF RICHARD ROE . . . .118 



Formation of character. Hereditary tendencies. In- 

 heritance of humanity. Inheritance of race characters. 

 Individual characters. The germ cell. Protoplasm. 

 Chromatin. Inequality of Nature's divisions. Atavism^. 

 The mid-parent. The thoroughbred. Changes through 

 experience. Inheritance of acquired characters. Nature 

 of acquired characters. Prenatal influences. Transmis- 

 sion of impaired vitality. Ibsen's ghosts. Potentialities 

 not character. The higher heredity. The unity of the 

 ego. The ego a co-operation. Fame not greatness. 

 Counting one's ancestors. Lineage of a little girl. All 

 Englishmen of noble birth. Effect of primogeniture. 

 Origin of the English character. Race types and the 

 survival of the existing. 



VI. THE PHYSICAL BASIS OF HEREDITY. By Professor 



Frank Mace McFarland 147 



The cell theory. The meaning of the term "cell." Uni- 

 cellular and multicellular organisms. The essential 

 parts of the cell. The protoplasm. The nucleus. Ka- 

 ryokinesis. The chromosomes. Division of the centro- 

 some. The spindle. Division of the chromosomes. 

 Phases of cell division by karyokinesis. Direct division. 

 Somatic and reproductive tissues. Differentiation of so- 

 matic and reproductive tissues in Ascaris. Reproduction 

 in Protozoa. Conjugation. Gradual differentiation of 

 reproductive cells. Reproduction in Eudorina. Repro- 

 duction in Metazoa. Fundamental identity of the germ 

 cells. The egg cell. Maturation. The sperm cell. 

 Fertilization. Cleavage. The reduction of the chromo- 

 somes. Theories as to structure and significance of the 



