Paramecium, 51, 129. 

 Parasites, 17. 

 Parental care. 108. 

 Parthenogenesis, 84. 

 Petal. 101. 

 Pistil, 101. 

 Plant lice, 86. 

 Pleurococcus, 12. 

 Poisons, 5. 

 Pollen, 101. 

 Pollination, 102, 134. 

 Polyandry, 118. 

 Polygamy, 118. 

 Potato, 41, 

 Prothallia. 76. 

 Protonema, 73. 

 Protoplasm, 15. 



Race suicide, 131. 

 Rate of reproduction, 127. 

 Reduction, division, 57, 81. 

 Reproductive instincts, 11. 

 Resting spores, 32. 

 Rhizoids, 76. 

 Root tip, 3. 

 Runners, 38. 



Salmon, 46. 

 Self-fertilization, 133. 

 Self-pollination, 134. 

 Sepal, 101. 

 Seta. 75. 



Sex, 58. 



Sex dimorphism, 69, 71, 96. 



Sparrow, 130. 



Spermary, 67. 



Sperms, 53, 57, 74. 



Spirogyra, 50. 



Spores, 27. 



Sporogonium, 76. 



Sporophyte, 58, 75. 



Stamen, 101. 



Stigma, 101. 



Stolon, 38. 



Strawberry, 38. 



Tadpole, 90. 

 Testis, 67. 

 Tubers, 40. 



Ulothrix, 28, 48. 

 Uterus, 98. 



Vagina, 98. 

 Vaucheria, 67. 

 Vertebrates, 88. 

 Vivipary, 86. 



Walter, H. E., 64. 

 Wheat rust, 30. 



Yeast, 21. 



Zoophytes, 24. 



144 



