LIST OF ILLUSTRATIONS. 



PAGE 



99. Scrophularia nodosa (after Bentham) ..... 144 



100. Section of Digitalis purpurea (after Ogle) . . . -145 



101. Ditto, more advanced ....... 145 



102. Ditto, still more advanced ....... 145 



103. Bartsia odontites (after Bentham) . . . . .146 



104. Ditto. Flower with a short pistil (after MUller) . . . 147 



105. Ditto. Flower with a long pistil ,, . . . 147 

 1 06. Euphrasia offidnalis (after Bentham) ..... 148 



107. Flower of ditto ......... 148 



108. Pedicularis sylvatica (after Ogle) ..... 150 



109. Lamium album (after Bentham) ...... 152 



no. Flower of ditto ......... 153 



in. Section of ditto ......... 153 



\i2.Salviaoffidnalis. Section of a young flower (after Ogle) . 156 



113. Ditto, visited by a Bee ,, . 156 



114. Ditto, older flower ,, . IS 6 



115. Stamens in their natural position ,, . 157 



116. Stamens when moved by a bee ,, ,, . 157 



117. Teucrium scorodonia, in the first state . . . 1 5% 

 1 1 8. Ditto in the second state ....... J 5 8 



119. Chenopodium bonus-henricus (after Bentham) . . 165 



1 20. Orchis mascula ,, ,, . . I 7 l 



121. Side view of flower, with all the petals and sepals cut oil 



except the labellum, of which the near half is cut away, 

 as well as the upper portion of the near side of the nectary 



(after Darwin) ........ 172 



122. Front view of flower, with all sepals and petals removed 



except the labellum (after Darwin) . . . .172 



123. The two pollinia ,, ,, ..... 172 



124. Ophrys apifera (after Bentham) . . . 175 



125. Cephalanthera grandiflora ,, . . . . 177 



126. Listera ovata ,, ,, .... 178 



127. Flower of Cypripedium longifolium. Front view . . 180 



128. Ditto. Seen from the side ...... 180 



129. Side veiw of Catasetum saccatum, with all the sepals and 



petals removed except the labellum (after Darwin) 182 



130. Section of ditto, with all the parts a little expanded 183 



