V. 



THE METHOD OF CREATION OF ORGANIC FORMS. 



Chapter I — Ox the Law of Acceleration and Retardation. — !N"ature 

 of law of Natural Selection. Two kinds of evidence. Illustration. 

 Examples from Cervidae, HelicidaB, insects and men. 



Chapter II — The Law of Repetitive Addition. — Segment and cell- 

 repetition. Illustration from limbs and vertebral column. A, On seg- 

 ment addition ; definitions. On repetition in bilateral and antero-pos- 

 terior symmetry ; in structure of compound teeth ; in segments of 

 Articulata; limbs of Reptilia ; brain of lain prey. B, On cell-repetition ; 

 simple segment a repetition of cells; simple diverticulum the same. 

 The cell theory ; the nucleated cell. C, Synthesis of repetition. From 

 unicellular to multicellular animals; simple repetition to compound 

 repetition ; Actinia, Lepidosiren, Ichthyosaurus, Plesiosaurus, Toenia ; 

 the heart; mammalian teeth. D, On growth-force; relation to other 

 forces; definition. E, Direction of repetition, its location, centrifugal 

 and longitudinal ; movements longitudinal. Inheritance ; its relation 

 to growth-force. 



Chapter III — The Law of Use and Effort. — Points to be investigated. 

 A, On the location of growth-force. Relation of efi'ort to use. Rudi- 

 mental characters. Examples of growth under influence of physical 

 laws ; Examples of colors under influence of light. Use and disuse of 

 gills. Rattlesnake ; horned animals. Teeth of ruminants. B, Change 

 in amount of growth-force. Local increase of growth-force. Convo- 

 luted structures; brain, teeth, cotyledons. Absolute loss of growth- 

 force. Teeth and toes of Ruminants ; incisors of Rodents. 



Chapter IY — On Grade Influence. — A, On the nature of Grade In- 

 fluence or Bathmism. Definitions. In plants; in animals. Increase 

 in time of Bathmism and growth-force. Vital forces and vital in- 

 fluences. Thought-force. Origin of Bathmism in time. B, Physio- 

 logical origin of Bathmism. Function of nervous system in force- 

 conversion. Automatic and habitual movements. Eflfect on nervous 



system. 

 Chapter V — Intelligent Selection.— Development of intelligence. Stim- 

 uli to use. Compulsion, Choice ; Bees, Food, Rattlesnake ; Change of 

 color; Mimetic analogy ; Examples. Development of character. 



In the present state of biological science, essays like the pres- 

 ent can only be tentative in so far as they treat of the laws of evo- 



