x LIST OF ILLUSTRATIONS. 



FIO. PAGE 



28. Terminal portion of Fig. 27 more magnified 25 



29. Primula (long-styled form) 27 



30. (short-styled form) 27 



31. Knautia dipsacifolia. (After Kerner) 37 



32. Carlina vulgaris. ( ,, ) 38 



33. Linnea borealis, flower of. ( ) 38 



34. Silenenutans. ( ) 39 



35. Larva of Arge galathea 46 



36. Larva of Smerinthus ocdlatus 47 



37. Larva of Chcerocampa elpenor. First Stage 52 



38. Second Stage ....... 53 



39. Just before second moult ... 53 



40. ., Third Stage 54 



41. Fourth Stage . 54 



42. Fifth Stage 55 



43. Full-grown (natural size) ... 55 



44. Chcerocampa pwcellus 59 



45. Aphis 71 



46. Contrivance for testing sagacity of Ants 115 



47. 124 



48. 125 



49. 125 



50. 126 



51. . 126 



52. Flint Implement from St. Acheul, near Amiens. Natural Size . 146 



**" JJ . 35 )) 5> ' ' ^' 



54. Section of Fig. 53, showing discoloration of surface 148 



