CONTENTS 



CHAPTER VIII 



MENDELISM (continued) 



PAGH 



Coupling : complete and partial Reversion on crossing : 

 masked characters Examples in peas, mice, and 

 sweet-peas Various Mendelian characters Doubt- 

 ful cases ; normal fertilization The supposed 

 ' swamping ' of new species on crossing with the old 

 Summary of Mendelian ideas Mendelism and 

 biometry : researches of Yule and Pearson Practical 

 applications : Biffen's work with cereals ; ' strength ' 

 of wheat-flour and rust-immunity - - - 197 



CHAPTER IX 



RECENT CYTOLOGY 



The cell Cell-division and cell-fusion The nucleus 

 Nuclear division The nature and properties of 

 chromosomes The reducing division The study of 

 the chromosomes in the light of Mendel's discovery 

 Chromomeres The heredity of sex The germ- 

 plasm theory .- - 235 



CHAPTER X 

 EUGENICS 



Sir Francis Gal ton, pioneer Genetics and biometry 

 Effect of civilization and humanitarianism Twins 

 Hereditary nature more important than training 

 Consequent legislation Restraint of propagation 

 Graduation of incomes Karl Pearson Eugenics 

 Education Society - - 284 



CHAPTER XI 

 CONCLUDING CHAPTER 



The science of genetics Mendel's law The ^-generation 

 and the 2#-generation Discontinuous variation 

 The mutation theory Continuous variations Gene- 

 tic variations and acquired variations Johannsen's 

 theory of the pure line The modern view of the 

 method of origin of new species The science of 

 genetics applied to human affairs George Bernard 

 Shaw's view of the situation - ... 300 



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