ANALYSIS OF CONTENTS. xi 



PAGB 



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 



