GLOSSARY AND INDEX 



ii 





Gill-openings, in young bird, 76. 



Gonad, the aggregate of the germ- 

 cells, 64. 



Grass, wind-pollination of, 38. 



Green algae, sexual differentiation 

 in, 21. 



Heredity, 6. 



Hermaphrodite, of flowers, those 



which contain both stamens 



and carpels, 37. 

 Humble-bee, agent of pollination 



of aconite, 40. 

 Hyla, ~o. 



Immobility of plants, its effect 

 on propagation, 38. 



Immortality, potential, Protozoa, 

 6 1 : germ-cells, 64 : germ- 

 plasm, 88. 



Impressed characters, not in- 

 herited, 65, 91. 



Inheritance, absence in impressed 

 characters, 65, 91 : colour in 

 fowls, 94 : colour in snap- 

 dragons, 97 : brachydactyly, 

 100 : stature, 102 : insanity, 

 105 : ability, 108 : mental 

 characteristics, in : physical 

 characteristics, in. 



Isogametes, those which are of 

 equal size and structure, 4. 



Land, adaptation for life on, 66. 

 Life, nature unknown, 51 : com- 

 plexity of vital processes, 51. 

 Lily, ovary of, 48. 



Macrogamete, the female gamete 

 or ovum, which is usually non- 

 motile, and is larger than the 

 male gamete which fuses with 

 it : 4, 82. 



Male gamete, or microgamete, or 

 spermatozoon, or spermatozoid, 

 the male sexual cell which is 

 usually motile, and is smaller 



than the macrogamete, with 

 which it fuses : 4. 



Malic acid, its effect on movement 

 of the spermatozoids of Ferns, 35. 



Mammals, 76. 



Man, gametes of, 5. 



Marsh Marigold (Caltha), ovule 

 of, 44 : carpels of, 48. 



Medium, internal, 67. 



Mendel's Law, 94, 98, 100. 



Microgamete, or spermatozoon, 

 or spermatozoid, the male ga- 

 mete, which is smaller than the 

 ovum with which it fuses : 4. 



Micropyle, the narrow channel 

 through which the pollen-tube 

 passes to the ovum in flowering 

 plants : 44, 45. 



Mortality, of animal body, 63. 



Motility of gametes, 22 : of 

 animals and plants, 32 : of 

 spermatozoids in water, 33. 



Multicellular organisms, which con- 

 sist of a number of cells, 2. 



Narcissus, pollen-tubes of, 43. 



Nephrodium, a Fern : antheridia 

 and spermatozoids of, 24. 



Nototrema, 71, 72. 



Nucleus, a definite, frequently 

 rounded body within the proto- 

 plasm, which contains chro- 

 matin and is the controlling 

 centre of the cell : 2, 3. 



Onoclea, a Fern : fertilization of, 

 26. 



Organization of animal body, 62. 



Ornithorhynchiis, 77. 



Ovule, the future seed of flowering 

 plants, which at the period of 

 flowering contains an ovum, 

 28, 42, 44, 48. 



Ovum, the female gamete, which 

 is usually non-motile, and being 

 larger than the male gamete 

 which fuses with it, it is often 

 called the macrogamete, 4, 5. 



