Heredity and sex . . 155-158 2. Operations on Birds . 3. Operations on Amphibia 4. Internal Secretions . 5. Operations on Insects 6. Parasitic Castration of Crust TABLE OF CONTENTS IX CHAPTER VI GYNANDROMORPHISM, HERMAPHRODITISM,PARTHENOGENESIS, AND SEX PAGK 1. Gynandromorphism 161-167 2. Hermaphroditism 167-173 3. Parthenogenesis 173-188 4. Artificial Parthenogenesis 188-193 CHAPTER VII FERTILITY 1. Inbreeding 194-199 2. Cross-breeding 200-207 3. Sexual Reproduction in Paramoecium . . 207-211 4. Theories of Fertility 211-219 CHAPTER VIII SPECIAL CASES OF SEX-INHERITANCE 1. Sex in Bees 2. A Se
Heredity and sex . . 155-158 2. Operations on Birds . 3. Operations on Amphibia 4. Internal Secretions . 5. Operations on Insects 6. Parasitic Castration of Crust TABLE OF CONTENTS IX CHAPTER VI GYNANDROMORPHISM, HERMAPHRODITISM,PARTHENOGENESIS, AND SEX PAGK 1. Gynandromorphism 161-167 2. Hermaphroditism 167-173 3. Parthenogenesis 173-188 4. Artificial Parthenogenesis 188-193 CHAPTER VII FERTILITY 1. Inbreeding 194-199 2. Cross-breeding 200-207 3. Sexual Reproduction in Paramoecium . . 207-211 4. Theories of Fertility 211-219 CHAPTER VIII SPECIAL CASES OF SEX-INHERITANCE 1. Sex in Bees 2. A Sex-linked Lethal Factor .... 3. Non-disjunction of the Sex-chromosomes 4. The Vanishing Males of the Nematodes 5. Sex-ratios in Hybrid Birds and in Crossed Races in Man 6. Sex-ratios in Frogs 7. Sex-ratios in Man 8. The Abandoned View that External Conditions Determine Sex 9. Sex-determination in Man .... BIBLTOGRHAPHY . INDEX . 220-221221-223223-224224-225 225-227 228-229229-232 232-236236-249 251-278279-282. HEREDITY A^D SEX CHAPTER I The Evolution of Sex Animals and plants living to-day reproduce them-selves in a great variety of ways. With a modicum ofingenuity we can arrange the different ways in seriesbeginning with the simplest and ending with the morecomplex. In a word, we can construct systems ofevolution, and we like to think that these systems revealto us something about the evolutionary process thathas taken place. There can be no doubt that our minds are greatlyimpressed by the construction of a graded series ofstages connecting the simpler with the complex. It istrue that such a series shows us how the simple formsmight conceivably pass by almost insensible (or atleast by overlapping) stages to the most complicatedforms. This evidence reassures us that a process ofevolution could have taken place in the imagined our satisfaction is superficial if we imagine thatsuch a survey gives much insight either into the causalprocesses that have produced the success
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