Index. 



219 



Hertwig, O., theory of heredity, 2 ; 



on polar bodies, 46, 125. 

 Hildebrand, or effect of pollen 



upon somatic tissues (Xenia), 



80 ; on Orchideae, 80. 

 His, theory of heredity, 2. 

 Hoffmann, on the inheritance 



of acquired characters, 93-4, 



114. 

 Hydromedusaj, Weismann on 



generative cells of, 7r, 109; 



illustrate continuity of germ- 

 plasm, 72-73. 



I. 



Identical twins, 41. 



Idio-plasm, Nageli's term, 31 ; A 

 and B, 31-32 ; sell- multiplica- 

 tion of, 34 ; amount of idio- 

 plasm A in the nucleus, 40. 



Ids, 123. 



Individual differences, Weismann, 



39. 4i> 43- 



Influence ol a previous sire upon 



the progeny of the same dam, 



see Telegony. 

 Influence of external conditions, 



see Acquired characters. 

 Influence of pollen upon somatic 



tissues, see Xenia. 

 Inheritance of acquired characters, 



see Acquired characters. 

 Invertebrates, Weismann on sexual 



apparatus of, 72, 74, 109. 



Jelly-fish, regeneration in, 4. 

 Jordan, on inheiiiance of acquired 

 characters in plants, 93. 



K. 



Karyokinesis, 37. 



L. 



Lamarck, Weismann and, 16, 21. 

 Lamarckian factors, importance 



of > 57> 59? 62 > 6 5> 6 7, 69, 82, 

 106 108, 111-112, 128, 147. 

 Lile, duration of, 7, 10. 



M. 



Malingie-Nouel, on Telegony, 

 j 93 et seq. 



Malva, Gartner on, 80. 



Maupas, on the Protozoa, 101, 

 148. 



Metazoa and Metaphyta, cause of 

 mortality of, 7, 24, 148; rela- 

 tion of progeny to paients in, 

 16 ; transmission of acquired 

 characters in, 16 ; propagation 

 in, 51. 



Mivart, on inheritance of acquired 

 characters, 94. 



Molecules, 54, 123. 



Morton, Earl of, on Telegony, 

 192. 



Muller, Fritz, on bud- variation, 



95-. 

 Multicellular organisms, see Me- 

 tazoa and Metaphyta. 



N. 



Nageli, theory of heredity, 2 ; and 

 idio-plasm, 31, 187 ; and germ- 

 plasm, 36 ; on inheritance of 

 acquired characters in plants, 



93- 



Natural selection, the cause of 

 death, 8 ; action of, 20 ; the 

 material for the operation of, 

 13, 57 ; not the cause of sexual 

 propagation, 13-14; and the 

 Protozoa, 15, 101-102 ; and 

 germ- plasm, 21 ; sole cause of 

 organic evolution, 25, 59, ill, 

 114. 



Nouel, Malingi^-, on Telegony, 

 193 et seq. 



Nucleo- plasm, of germ and soma- 

 tic cells, 30. 



Nucleus, alone contains germ- 

 plasm, 29 ; contains two 

 substances, 33 ; and heredity, 

 37 ; and polar bodies, 40 ; 

 amount of idioplasm A in, 40. 



Nutritive congenital changes, 64. 



O. 



Orchideae, Hildeband on, 80. 

 Organic evolution, the cause of, 



