INDEX 



107 



Sedum, sp., adaptations of, 53 

 Self - adaptations, recognised by 



Wallace and Weismanu, 27 ; 



by Reid, 29, 30 ; by Hiern, 102 

 Solanum Dulcamara, variations in 



the structure of stems, 42 

 Soma, responses by the, hereditary, 



11 



Spines, hereditary, 32 

 Sports, origin of, 18 

 Stems, self-supporting compared 



with climbing, 42, 43 

 Strawberry runners, hereditary 



roots of, 39 

 Struggle for existence, explained, 



17 



Subterranean stems, origin of, 82 

 Succulency in plants, chap, v., 50 ; 



caused by salts, 50 ; use of, 51 ; 



evidence of response, 51 ; per- 

 manent and hereditary, 64 ; 



tenacity of life, 54 



TAXARH, secretions of, 50 

 Thomson, on Heredity, 19 

 Tillandsia, adaptations of, 57 

 Timber, xerophytic, 30 

 Transitional structures, 48 



Trichosanthes, forming adhesive 

 pads, 41 



USE and disuse, effects of inherited, 

 12 



VARIATIONS, innate, not proved, 2 ; 

 definite and indefinite, origin 

 of, 2 ; as acquired characters, 3 



Virginia creeper, response in, 10 



WALLACE, recognises self-adapta- 

 tion, 27 ; that there is " no 

 valid evidence of the trans- 

 mission of modifications" dis- 

 proved, 36 



Warming, on the origin of climb- 

 ing plants, 44, 45 



Weismann, recognises self-adapta- 

 tion, 27, 104 ; his theory refuted, 

 73 



Wistaria, climbing and self-sup- 

 porting stems, compared, 42 



ZILLA, experiment with, showing 

 hereditary character of spines, 

 33 



