By G. Lelievre, COM International Judge, in collaboration with F. Vasseur, COM International Judge.
 
Translated from French by Sebastian Vallelunga.
 
Table of Contents:
 
Preface to the French Edition 
Preface to the English Edition 
Preliminary Idea of Heredity 
The Laws of Inheritance 
Hereditary Maladies 
Generalities 
Hereditary Maladies
Contagious Maladies 
Non-Hereditary and Non-Contagious Diseases
The Origins and Development of Maladies 
A Malady of Dominant Character - Rickets 
A Malady of Recessive Character - Epileptic Fits
Hereditary Pre-Disposition for Maladies 
The Behavior of Predisposition in the Process of Heredity 
The Heredity of Canary Song
Generalities 
The Influence of the Milieu 
The Hereditary Structure of the Vocal Apparatus 
Hereditary Predisposition for Song
The Diverse Directions of Song
Song Factors 
Matters of Song in the Pairing and Breeding of Birds
Crossing Effect
To Conserve the Same Song of Quality 
To Complete the Repertoire of a Line by Adding a Tour 
To Complete the Repertoire by Adding a Tour of a Different Song Direction 
Appendix: The Standard Colors of the Waterslager and the Functions of the Laws of Heredity
Generalities 
The Yellow Color - Plumage Lipochrome 
The Dominant White Factor 
A White Waterslager or Malinois of Pure Race?
The Red Factor
The Recessive White Factor 
Melanin Color
Red Eyes
Final Reflections