LIST OF ILLUSTRATIONS 



XV 



FIGU 



39- 

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n- 



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 84. 



RE 



m: 



ale 



blue 



A fragment of a Lichen 



A fragment of a Silver Poplar root 



Potent ilia verna ..... 



Flower of Meadow Sage 



Alpine Lousewort (Pedictilans asplenifolia) 



Flower of Birth wort [Aristolochia clematitis) 



Alpine Butterwort {Pinguicula alpina) 



Daphne mezereum and Daphne striata . 



Common Orchis {Orchis mascnla) . 



Head of a Butterfly . . . , 



Mouth-parts of the Cockroach 



Head of the Bee ..... 



Flowers of the Willow . 



The Yucca-moth {Proniiba yuccaseUa) . 



The fertilization of the Yucca 



Scent-scales of diurnal Butterflies 



A portion of the upper surface of the wing of a 



menalcas) 

 Zeuxidia tvallacei, male 

 Leptodora hyalina . 

 Moina paradoxa, male . 

 Moina paradoxa, female 

 An Amceba : the process of division 

 Steiitor rceselii, trumpet-animalcule 

 Holophnja multifiliis 

 Pandorina niorum .... 

 Voh'ox aiirens .... 



Fiiciis platycarpus, brown sea-wrack 

 Copulation in a Daphnid (Lyncaeidj 

 Spermatozoa of various Daphnids . 

 Spermatozoa of various animals . 

 Diagram of a spermatozoon . 

 Ovum of the Sea-urchin 

 Daphnella ..... 

 Bijthotrephes longimanus 

 Sida crystallina, a Daphnid . 

 Diagrammatic longitudinal section of a hen's egg 

 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 



before incubation 



' {Lycrena 



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