CONTENTS xiii 



THE MOVEMENTS AND FUNCTIONS OF SENSITIVE, INSECTIVOROUS, CLIMBING, 



AND OTHER PLANTS 



PAGE 



§§ 188-189. The Sensitive Plants and Pitcher Plants ... . 587-593 



The Droseraceae or Insectivorous Plants Proper .... 593 



§§ 190-195. Aldrovanda vesiculosa — Drusophyllum liisitanicum — Roridula — Bi/llis gigantea — Dionfpct musci- 



pula or Venus's Fly-trap — The Sun-Dew [Druscra vol umh folia) . 597-601 



Sensitive Moving Plants— Spiral Climbing Plants— Revolving and Twisting Stems, Tendrils, 



Leaves, &c 605 



§§ 196-200. Stem and Tendril Chmbing Plants — Spirals Formed by the Tendrils of the Passion-flower, Sweet- 

 pea, Cucumber, and Vegetable Marrow ... .... 614-626 



Design in Climbing, Sensitive, and Insectivorous Plants 629 



§ 201. Growth in Plants and Animals . ... 631 



The Universality of Spirals in Nature as indicated by Stereo-Chemistry, &c. • 633 



Spiral Arrangements in the Physical Universe . . 634 



Spiral Arrangements in the Vegetable Kingdom 636 



Spiral Arrangements in the Animal Kingdom . 645 



SPIRAL FORMATIONS IN PLANTS 



§§ 202-209. Spirahty in Plants the Product of Life and Original Endowment — Spiral Seeds — Spiral and Other 

 Cells in Plants — Spiral Fronds and Flowers — Spiral Hairs — Spiral Distribution of Leaves and Branches — 

 Spiral Stems of Plants and Boles of Trees — Spiral Fossil Stems . . . 662-667 



Spiral Climbing Plants — Revolving and Tvristing of Stems, Tendrils, &c. • 669 



§ 210. Eespiration of Plants and Animals . . . . . 670 



§ 211. Growth in Plants and Animals a leading Factor in Spiral Formations and Functions . 671 



THE GROWTH OF SPIRAL SHELLS, HORNS, BONES, TEETH, FEATHERS, &c., IN 

 RELATION TO SPIRAL PLANTS, BRANCHES, LEAVES, TENDRILS, FLOWERS, 

 FRUITS, SEEDS, &c. 



§ 212. The Prevalence of Spiral Formations : their Physiological Significance in Relation to Walldng, Swimming, 

 and Flying — The double figure-of-8 Curves and Spirals made by the Wings in Fhght not known to 

 Leonardo da Vinci . . . ... .... 676 



THE ORIGIN OF SPECIES— VARIOUS VIEWS 

 § 213. Consideration of the Theory of the Origin of Species by Means of Natural Selection— Objections to 



the Theory 689 



§§ 214-215. The Origin of Species Undetermined and Indeterminable— Professor Haeckel an Advanced Exponent 



of the Darwinian Theory • 691-699 



SPONTANEOUS GENERATION— As Advocated by Professor Haeckel . . . .714 



§ 216. Short History of Spontaneous Generation— Recent Views . . . 718 



Heredity and Descent— Transmission of Peculiarities Natural and Acquired— Formation, Use, 



and Disuse of Organs 724- 



§ 217. A First Cause Necessary to Life— Life Transmissible— Types of Plants and Animals versus Evolution 



and Spontaneous Generation ... 729 



