ILLUSTRATIONS 



XV 



Figure 



39. Seedling of the Bean, Vicia Faba 



Darwin's Elements of Botany. 



40. A Laurel twig, A in the frozen, and B in the thawed condition 

 Darwin and Acton's Practical Physiology of Plants. 



41. Paramoecium caudatum ...... 



After Biitschli. 



42. Planar ia poUjchroa swimming ..... 



43. The Edible Snail, i/eZiajpoma/ia ..... 

 From Hatschek and Cori. 



44. Underview of a Starfish, Echinasier sentus . 

 From Agassiz. 



45. Map showing the range of the American Golden Plover 



From the Bureau of Biological Survey, Washington. 



46. Transverse section of an Oak-trunk 

 From Le Maout and Decaisne. 



47. 



i8. 



49. 

 50. 



Otoliths of Plaice ....... 



After Wallace. 



Section of a Pearl ...... 



From Rubbel. 



Shells of a Fresh-water Mussel, Anodonia mutabilis 



lulus terrestris 

 From Koch. 



51. Nereis pelagica 

 After Oersted. 



52. View of female Cyclops sp. . 

 After Hartog. 



53. The Wood-ant, Formica rufa 



54. The Honey-bee, Apis melUfica 



55. A Wasp, Polistes tepidus 



56. Yeast highly magnified 

 Darwin's Elements of Botany, 



57. Creeping Buttercup 

 (Praeger's Weeds.) 



58 . BougainviUea fructuosa 

 From Allman. 



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