GLOSSARY AND INDEX 



Numerals in heavy type signify that an illustration is given on the 



page quoted 



Acctabularia, isogarnetes of, 22 



aconite, dependence on Humble 

 Bee, 40. 



acquired characters, those im- 

 pressed on the organism in the 

 course of its individual life : 65, 

 91. 



adiantum, a Fern, embryo of, 36. 



Agrostemma, pollen-tubes of, 43. 



allantois 75, 76. 



Alytes, 69 ; 70. 



amnion, 75. 



amphibians, reproductive adapta- 

 tions, 68. 



Animal agency, in pollination, 39. 



Antheridium, the male organ, for 

 instance of a Fern, which con- 

 tains spermatozoids, 25. 



Aquatic stages, in development, 

 67 



Archegonium, the female organ, 

 for instance of a Fern, which 

 contains one ovum, 26. 



Balance, of human body, 52. 



Birds, egg, 72, 74, 75 : embryo, 76 



Birth-rate, 112. 



Bladder-wrack (Fucus), 15 : pro- 

 pagation of, 1 8 : gametes and 

 fertilization of, 20. 



Body-plasm, the protoplasm of the 

 body-cells, as opposed to the 

 germ-plasm 88. 



Brown Seaweeds, sexual differ- 

 entiation in, 15-20. 



Budding, in Plants ; a separation 

 of a part of the plant-body, 

 which grows directly into a 

 new individual, 4 : repeats the 

 characters of the parent, 7. 



Carpels, the leaves at the centre 

 of a flower, enclosing the ovules, 

 28, 48. 



Cell, the structural unit of the body 

 of animals and plants, 2, 3. 



Cell-division, the ordinary method 

 of increase in number of cells, 

 one cell dividing into two, 3. 



Cell-theory, 2. 



Chromatin, the most conspicuous 

 constituent of the nucleus, and 

 generally identified as the phy- 

 sical basis of heredity, 85. 



Chromosomes, bodies into which 

 the chromatin is concentrated 

 before division of the nucleus. 

 At other times the chromo- 

 somes are diffused through the 

 nucleus, and their individual 

 boundaries are not distinguish- 

 able, 83, 85. 



Conjugation, the coalescence of 

 two equal gametes, 16, 22. 



Co-operation, in living body, 53. 



Copromonas, 54 ; life-history, 56. 



