X CONTENTS 



PART IV 



PAOB 



THE PRIMORDIA 51 



The Adult State is a State of Equilibrium — Each Primordium repre- 

 sents a State of Equilibrium — Individual Adaptation (Accommodation) 

 is Equilibrium — Classification of the Primordia with reference to their 

 Development — Sensitive Period — Correlation — Independence of the 

 Primordia — Psedogenesis — Measurement of a State of Equilibrium — 

 Curves of Development — Leading Property — Variation in Embryology 



PART V 

 ATTEMPT AT A CLASSIFICATION OF THE PRIMORDIA 66 



Numerous Primordia mentioned in existing Descriptive Literature — 

 Classification of the Primordia (Bateson) — Spirogyra (Primordia, 

 Sensitive Period) — Uniaxial System — Radial System — Pediastrum — 

 Morphological Homology and Mechanical Concordance — Volvox^ 

 Hydrodictyon — Systems of Segmentation derived from the Uniaxial 

 System — Ramification — Pseudochcete — Complicated Cases — Primordia 

 of Trees, Cuttings, Grafts, etc. — The Notion of Individual — Series of 

 Subordinate Biological Units — Secondary Segmentation — Rectangular 

 Biaxial System (Chess-board System) — Alterations of the Chess-board 

 System — Intermediate Units — Vexillary Marks — Gradation — Differ- 

 entiation — Simple and Compound Axes — Curved Axes — Disorder — 

 False (Oblique) Axes — Second Secondary Segmentation : Rectangular 

 Triaxial System — Shell of the Molluscs 



PART VI 



THE MEASUREMENT OF VARIABLE PROPERTIES OF ANIMALS 

 AND PLANTS. SIMPLE NOTIONS OF PROBABILITY 

 (FREQUENCY) 115 



Position of Equilibrium of a Sphere on a Horizontal Plane — Chance — 

 Specific Energy— One Coin (Head or Tail) — A System of Two Coins — 

 Three Coins — An Unlimited Number of Coins — An Urn containing 

 Two Sorts of Balls, Three Sorts of Balls— One Die, Two Dice— Co- 

 existence of Simple Events — Various Ways in which they may be 

 combined into Compound Events — Diversity of the Effects 



Application of the Principles of Frequency on the Hereditary Trans- 

 mission of Primordia in the Mendelian Hybrids — Segregation 



Measurement of the Density of a Solid Body — Curve of Errors — 

 Measurement of a given Weight of a certain Substance — A Mixture of 

 Two Volumes of Water — A Mixture of an Acid and an Alkaline Liquid 

 — Continuous and Discontinuous Variation — Unilateral Variation — 

 Influence of Growth — Embryological Curves 



An Urn containing Two Sorts of Prisms— Variation Curve — Ex- 

 treme Values and Mean Value — Experiments with Cards— Biological 

 and Inorganic Variation Curves— Conditions of Existence— Components 

 of Chance — Optimal Values — Values w-c'-il/— Significance of a Mean 

 Value — The Highest Value of a Variable Primordium is a Specific 

 Constant — Minimal Value — Conventions— Usefulness of Mean Values 

 for Comparing Two or More Series of Measurements 



