CONTENTS 



CHAP. PAGE 



I. Introductory 1 



II. On Magnitude 22 



III. The Rate of Growth 78 



IV. On the Internal Form and Structure of the Cell . . 286 



V. The Forms of Cells 346 



VI. A Note on Adsorption 444 



VII. The Forms of Tissues, or Cell-aggregates . . . 465 



VIII. The same (continued) . . 566 



IX. On Concretions, Spicules, and Spicular Skeletons . . 645 



X. A Parenthetic Note on Geodetics 741 



XI. The Equiangular Spiral 748 



XII. The Spiral Shells of the Foraminifera .... 850 



XIII. The Shapes of Horns, and of Teeth or Tusks: with 



a Note on Torsion 874 



XIV. On Leaf-arrangement, or Phyllotaxis .... 912 



XV. On the Shapes of Eggs, and of certain other Hollow 



Structures 934, 



XVI. On Form and Mechanical Efficiency .... 958 



XVII. On the Theory of Transformations, or the Comparison 



OF Related Forms 1026 



Epilogue 1093 



Index 1095 



Plates 



A Splash of Milk Frontispiece 



The Latter Phase of a Splash . . " . . . . facing page 390 



