LIST OF ILLUSTRATIONS 



FIG. PAGE 



1. Nerve-cells, from larger and smaller animals (Minot, after Irving 



Hardesty) .......... 



2. Relative magnitudes of some minute organisms (Zsigmondy) . 



3. Curves of growth in man (Quetelet and Bowditch) 



4. 5. Mean annual increments of stature and weight in man (do.) 

 6. The ratio, throughout life, of female weight to male (do.) 



7—9. Curves of growi;h of child, before and after birth (His and Riissow 



10. Curve of growth of bamboo (Ostwald, after Kraus) 



11. Coefficients of variability in human stature (Boas and Wisslerl 



12. Growth in weight of mouse (Wolfgang Ostwald) 



13. /)•-). cf silkworm fLuciani and Lo Monaco) 

 ]i. Do. of tadpole (Ostwald, after Schapcr) . 



15. Larval eels, or Leptocephali, aiid young elver (Joh. 



16. Growth in length of Spirogyra (Hofmeister) 



17. Pulsations of growth in Crocus (Bose) 



18. Relative growi;h of brain, heart and body of man 



19. Ratio of stature to span of arms (do.) 



20. Rates of growth near the tip of a bean-root (Sach 



21. 22. The weight-length ratio of the plaice, and its 



changes ....... 



23. Variability of tail-forceps in earwigs (Bateson) 



24. Variability of body-length in plaice 



25. Rate of growth in plants in relation to temperature (Sachs) 



26. Do. in maize, observed (Koppen), and calculated curves . 



27. Do. in roots of peas (Miss I. Leitch) .... 



28. 29. 



Schmidt) 



Quetelet) 



37 



39 



61 



66, 69 



71 



74-6 



77 

 80 

 8S 

 84 

 85 

 86 

 87 



annual periodic 



90 

 94 

 96 



99, 100 

 104 

 105 

 109 

 112 

 113 



115,6 

 119 

 120 



Rate of growth of frog in relation to temperature (Jenkinson 

 after O. Hertwig), and calculated curves of do. 



30. Seasonal fluctuation of rate of growth in man (Daffner) 



31. Do. in the rate of growth of trees (C. E. Hall) 



32. Long-period fluctuation in the rate of growth of Arizona trees 



(A. E. Douglass) 122 



33. 34. The varying form of brine-shrimps (Arte7nia), in relation to 



salinity (Abonyi) ......... 128,9 



35-39. Curves of regenerative growth in tadpoles' tails (M. L. Durbin) 140-145 



40. Relation between amoimt of tail removed, amount restored, and 



time required foi restoration (M. M. Ellis) .... 148 



41. Caryokinesis in trout's egg (Prenant, after Prof. P. Bouin) . . 169 

 42-51. Diagrams of mitotic cell-division (Prof. E. B. Wilson) . . 171-5 

 52. Chromosomes in course of splitting and separation (Hatschek and 



Flemmmg) 180 



