LIST OF ILLUSTRATIONS 



XV 



FIGURE 



38. A fragment of a Lichen 



A fragment of a Silver Poplar root 



Potent ill 1 ( verna ..... 



Flower of Meadow Sage 



Alpine Louse wort (Pedicidaris asplenifolia) 



Flower of Birthwort (Aristolochia clematitis 



Alpine Butterwort (Pinguicula alpina) 



Daphne mezereum and Daphne striata 



Common Orchis (Orchis mascula) . 



Head of a Butterfly 



Mouth-parts of the Cockroach 



Head of the Bee .... 



Flowers of the Willow . 



The Yucca-moth (Pronuba yuccasella) 



The fertilization of the Yucca 



Scent- scales of diurnal Butterflies 



A portion of the upper surface of the wing of a male ' blue ' (Lyccena 



menalcas) .... 



Zeuxidia wallacei, male 



56. Leptodora hyalina .... 



57. Moina paradoxa, male . 

 . Moina paradoxa, female 



An Amoeba : the process of division 

 Stentor rceselii, trumpet-animalcule 

 Holophrya multifiliis 

 Pandorina morum .... 

 Volvox aureus .... 



Fucks platycarpus, brown sea-wrack 



65. Copulation in a Daphnid (Lyncand) 



66. Spermatozoa of various Daphnids . 

 Spermatozoa of various animals . 

 Diagram of a spermatozoon . 

 Ovum of the Sea-urchin 

 Daphnella ..... 

 Bythot replies lonyimanus 

 Sida crystalline/,, a Daphnid . 



Diagrammatic longitudinal section of a hen's egg befo 

 Diagram of nuclear division .... 

 Process of fertilization in Ascaris megalocephala 

 Diagram of the maturation divisions of the ovum 

 Diagram of the maturation divisions of the sperm-cell 

 Diagram of the maturation of a parthenogenetic ovum 

 The two maturation divisions of the ' drone eggs ' of the Bee 

 Fertilization of the ovum of a Gasteropod 

 Formation of polar bodies in a Lichen . 

 Fertilization in the Lily 

 Conjugation of Noctiluca 

 Conjugation and polar body formation in the Sun-animalcule 



39- 

 40. 



41. 



42. 



43- 



44. 



45- 

 46. 



47- 

 48. 



49. 



50. 



Si- 

 52. 



53- 

 54- 



55- 



58. 



59- 

 60. 



61. 



62. 



63. 

 64. 



67. 

 68. 



69. 

 70. 



7i. 



72. 



73- 



74- 



75- 

 76. 



77- 

 78. 



79- 

 80. 



81. 



82. 



S3- 



84. 



re incubation 



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