x CONTENTS 
Multimodal curves . : 
Correlation and the sorrelation coe tauient 
Regression . : 
Employment and ile Bs ihe Sretiencal oeihode 
CHAPTER IV 
Tur Puysican Basts or HEREDITY 
Introductory . ; 
Heredity a consequence ie he gene alia ¢ Saving ik Sie 
The chromosomes 
Somatic cell division 
The production of germ colle. 
Synapsis—its significance : 
Independent distribution of AGREE : 
Number of chromosome combinations. 
Chromosomes and sex in Drosophila. 
Recapitulation of the mechanism of heredity 
CHAPTER V 
INDEPENDENT MENDELIAN INHERITANCE 
Introductory. : ‘ 
Mendelism esse ie sibs ease a : 
Mendel and his discovery . 
The monohybrid . 
Mendelian terminology . 
The chromosome interpretation in a Oe ond ; 
Sex-linked irheritance. ‘ 
The mathematical adequacy of endear 
The dihybrid. 
A case in maize 
The chromosome ratee pretation! 
Mathematical consideration . 
A case in guinea pigs 
A case in Drosophila . 
The trihybrid 
A case in Enapdeaepra, 
Multi-factor hybrids : 
Four-fold factor eaieeeiaeats in mice. 
Methods of dealing with genetic data . 
Validity of segregation ratios. 
CHAPTER VI 
Linkacr ReLations IN MENDELISM 
Introductory . 
Chromosome aumabers: end fae io 
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