The science of life : fully illustrated in tone and line and including many diagrams

CONTENTS

CHAPTER III. Tur EvipENCE FROM PLANT AND ANIMAL STRUCTURE

PAGE PAGE

. Structural plans, visible and § 2. Vestiges: the evidence of the invisible : : : . 216 useless. . 220 § 3. The evidence ‘of the embryo »- 222

CHAPTER IV. THE EVIDENCE FROM THE VARIATION AND DISTRIBUTION OF LIVING THINGS

. The variability of living things 228 § 3. The distribution of living things 236 e 2, What is a species? . . 230 § 4. The evidence summarized . 244

CHAPTER V. Tue Evorution or Man

$1. Man: a Vertebrate; a Mam- § 3. Man’s body : a museum of evomal; aPrimate . : . 24:7 lution. : . 253 §2. Fossilmen . 5 , . 250 § 4. Man’s place in . Time : » 255 BOOK IV

THE HOW AND THE WHY OF DEVELOPMENT AND EVOLUTION

CHAPTER I. THE Ess—ENCE OF THE CONTROVERSIES ABOUT EVOLUTION

§1. The chief theories of evolution 261 § 2. Method of treatment : . 265

CHAPTER II. How Inprvipuats ORIGINATE

§1. Can life arise spontaneously ? 267 §6. Artificial propagation. 275 § 2. Sexless reproduction the ereia) § 7. A note on the regeneration of method . 268 lost parts . 2a §3. Sex is a complication of. repro- § 8. Grafts and the Chimera . . 278 duction . : 2 25 § 9. What is meant by the germ§4. The Gametes, or marrying cells 272 plasm. : ‘ : . 280 § 5. Some evasions and replacements of sexuality . : , » 276

CHAPTER III. Tse Mercuanism oF INHERITANCE

. How our cells multiply . . 282 § 4. What the Chromosomes are for 284 u 2, How the Gametes are formed . 283 § 5. Chromosomes in plants . . 286 §3. Fertilization . : . . 284,

CHAPTER IV. Tue A B C or GENETICS

§ 1. The different kinds of variation 287 § 7. Mapping the Chromosomes . 300 $9. The discoveries of the Abbé § 8. Plant breeding—some practical Mendel . . * 290 applications . ‘ : - 308 § 3. Mendel’s two primary laws of § g. Is inbreeding evil ? : . 304, heredity . 291 § 10. Reversion to ancestral type . 307 § 4. Numerical proof of Mendel’s § 11. How much of inheritance is laws. 296 Mendelian ? . ; , . 308 §5. Genes and their effects upon § 12. Some common superstitions human characteristics. 297 about heredity ; : 310

§6. Colour Genes in America as an example of mulape applicar tions : 299 vil