XIV CONTENTS 



PAGE. 



71. Female Wasp i ,s'/<Ar.r siicciosnn) carrying a Cicada to 



her burrow 92 



72. Section of Bartlett Pear flower 90 



73. Buds of Bartlett Pear 97 



74. Cluster of Bartlett Pear blossoms 98 



75. Flower of Bartlett Pear 99 



7G. Bud of the Bartlett Pear, with petals removed 99 



77. Bud of the Bartlett Pear 99 



78. Bartlett Pear cross-pollinated with the pollen of the 



Easter Pear 100 



79. Seeds from crossed and from self-pollinated Bartlett 



Pears 101 



80. Self-pollinated Bartlett Pear 101 



81. Baldwin Apple cross-pollinated with pollen of the Bell- 



flower Apple 102 



82. Large specimen of self-pollinated Baldwin Apple 102 



83. Small specimen of self -pollinated Baldwin Apple 103 



84. Section of an Apple blossom 103 



85. A cluster of Alfalfa blossoms 105 



86. Pollination of Alfalfa flower by Bee 100 



87. The many-flowered umbels of the Milkweed 107 



88. Flower of the Milkweed (Asclepiodora viridis) 108 



89. Longitudinal section of Milkweed flower 109 



90. Two pollen-masses joined by their bands 109 



91. Honey-Bee caught in entrapping slit of Milkweed blos- 



som 110 



92. Moth held fast in Milkweed blossom 110 



93. Insect caught in several flowers of Milkweed 110 



94. Honey-Bee caught in several blossoms of Milkweed 110 



95. Leg of insect with small chain of corpuscula 112 



96. Pollen-masses attached to leg of Bee 112 



97. Head of Pronuba Moth 114 



98. Ovipositor of Pronuba Moth for insertion of egg in deep 



ovary of Yucca Lily 114 



99. Female Pronuba Moth ovipositing on ovary of Yucca 



Lily 115 



100. Female Pronuba Moth thrusting her tentacles and pro- 



boscis into the stigmatic opening 110 



101. Scale insect (Pulvinaria pruni) on Plum twigs 121 



