xii Contents 



CHAPTER PAGE 



IX. GAMETIC COUPLING AND SPURIOUS ALLELOMORPHISM . 148 



Pollen-Shape and Flower-Colour. Axil-Colour and Sterile Anthers 

 Hooded Standard and Flower-Colour in Sweet Peas. 



X. HEREDITY AND SEX 164 



Evidence from Breeding Experiments. Bryonia Sex-limited Heredity. 

 The Horns of Sheep Colour-Blindness Sex and Spurious Allelo- 

 morphism. The Currant Moth The Cinnamon Canary The Silky 

 Fowl Aglia tau Cytological Evidence Summary. 



XL DOUBLE FLOWERS . . . . . . . .196 



Miscellaneous Cases. Recessive and Dominant Doubling " Hose-in- 

 Hose " Flowers The Special Case of Double Stocks. 



XII. EVIDENCE AS TO MENDELIAN INHERITANCE IN MAN . 205 



Normal Characters -Diseases and Malformations. Dominants Sex- 

 limited Dominants Recessives Notes on collecting Evidence. 



XIII. INTERMEDIATES BETWEEN VARIETIES AND THE "PURE 



LINES" OF JOHANNSEN ...... 235 



Intermediates as Heterozygous Forms Subtraction-Stages of Dominants 

 Interfering Factors Fluctuational Forms "Pure Lines." 



XIV. MISCELLANEOUS EXCEPTIONAL AND UNCONFORMABLE PHE- 



NOMENA ......... 245 



Crosses breeding true without Segregation. Parthenogenetic or Apo- 

 gamic Forms. Hieracium Sexual Forms Numerical Aberrations 

 Irregularities of Dominance Alternation of Generations Mater- 

 nal Characters in certain Seeds. 



XV. BIOLOGICAL CONCEPTIONS IN THE LIGHT OF MENDELIAN 



DISCOVERIES . . . . . . . . . 266 



Nature of Units Nature of Segregation Moment of Segregation 

 Differentiation of Parts compared with Segregation Reversion and 

 Variation. " Bush " and " Cupid " Sweet Peas Mendelian Segre- 

 gation and Species Discontinuity in Variation Mendelism and 

 Natural Selection. 



XVI. PRACTICAL APPLICATION OF MENDELIAN PRINCIPLES . 291 



Meaning of Pure-bred Rogueing Raising Novelties A Practical Ex- 

 ample Unfixable Types Technical Methods Sociological Appli- 

 cation. 



PART II. 



1. BIOGRAPHICAL NOTICE OF MENDEL ..... 309 



2. TRANSLATION OF THE PAPER ON HYBRIDISATION . . . 317 



3. TRANSLATION OF THE PAPER ON Hieracium . . . .362 



BIBLIOGRAPHY 369 



SUPPLEMENTARY LIST . . . 385 



INDEX OF SUBJECTS . . . . . . . . . 386 



INDEX OF AUTHORS " . . . . 394 



