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Contents
| A DEFENCE OF MENDEL'S PRINCIPLES OF HEREDITY, 104—208. | ||
| Introductory, 104. | ||
| I.The Mendelian Principle of Purity of Germ-Cells and the Laws of Heredity based on Ancestry, 108. | ||
| II.Mendel and the critic's version of him. | ||
| The Law of Dominance, 117. | ||
| III.The Facts in regard to Dominance of Characters in Peas, 119. | ||
| The normal characters: colours of cotyledons and seed-coats, 120. Shape, 122. Stability and variability, 124. Results of crossing in regard to seed-characters: normal and exceptional, 129. Analysis of exceptions, 132. The "mule" or heterozygote, 132. | ||
| IV.Professor Weldon's collection of "Other evidence concerning Dominance in Peas." | ||
| A. In regard to cotyledon colour: Preliminary, 137. Xenia, 139. (1) Gärtner's cases, 141. (2) Seton's case, 143. (3) Tschermak's exceptions, 145. (3a) Buchsbaum case, 145. (3b) Telephone cases, 146. (3c) Couturier cases, 147. | ||
| B. Seed-coats and Shapes. 1. Seed-coats, 148. 2, Seed-shapes: (a) Rimpau's cases, 150. (b) Tschermak's cases, 152. 3. Other phenomena, especially regarding seed-shapes, in the case of "grey" peas. Modern evidence, 153. | ||
| C. Evidence of Knight and Laxton, 158. | ||
| D. Miscellaneous cases in other plants and animals: 1. Stocks (Matthiola). Hoariness, 169, Flower-colour, 170. 2. Datura, 172. 3. Colours of Rats and Mice, 173. |
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| V.Professor Weldon's quotations from Laxton, 178. | ||
| Illustration from Primula sinensis, 182. | ||
| VI.The argument built on exceptions, 183. | ||
| Ancestry and Dominance, 185. | ||
| Ancestry and purity of germ-cells, 193. | ||
| The value of the appeal to Ancestry, 197. | ||
| VII.The question of absolute purity of Germ-cells, 201. Conclusion, 208. | ||
