4i 8 SCIENCE FROM AN EASY CHAIR 



Hooker, Sir Joseph, Darwin and 

 Wallace . papers communi- 

 cated to Linnean Society by, 



12, 13 



Hop-blight, causes of, 317-319 



prevention of, 318, 319 

 Hop-louse, 317 



Hops, brewing industry as affecting 

 growers of, 321 



cultivation of, 315-316 



curing of, 320 



English growers as affected by 

 American and German hop- 

 plantations, 320, 321 



uses made of, 315 



Horses, absence from American 

 continent in fifteenth 

 century of living asses, 

 zebras, and, 89 



ancestral, change in size and pro- 

 portions of, 84, 85 

 lower Tertiary Hyracotherium, 



84 



middle Tertiary, 84 

 "pre-orbital cup" in Hip- 



parion, 85, 86 



upper Tertiary Hipparion, 84- 

 86 



ancestry of, scientific points of 

 interest with regard to, 83- 

 90 



descent from Arab ancestry 

 evidenced by presence of 

 "pre-orbital cup" in, 86 



English thoroughbred, history and 

 ancestors of, 82, 90 



" Ergot " of, 89 



European, stock from which de- 

 rived, 77-78 



fossil remains of extinct, in North 

 and South America, 89, 90 



mark of difference between asses, 

 zebras, and, 87, 88 



mastery and muzzling of, by 

 ancient cave-dwellers, 80, 

 81 



Mongolian wild, absence of "pre- 

 orbital cup " in, 86 

 derivation of European horses 



from, 77-78 

 description of, 78 



prehistoric European, verified by 

 ancient carvings found in 

 caves, 79-81 



Horses continued 



selective breeding of, from time of 



cave-men onward, 82, 83 

 Southern or Arabian breeds of, 



presence of "pre-orbital 



cup " in, 86, 87 

 House-sparrows, 266 

 Huxley, Professor, calculation of, 



with regard to fecundity of 



plant-lice, 338 



Hydra, heraldic, derivation of, 116 

 Hyracotherium horse, 84 



India, practice of opium eating in, 



366 



Infants, blindness of, congenital, 272 

 mortality of, varied congenital 



defects causing, 272 

 Insects, association of, with plants, 



296 

 colour-protection and invisibility 



of, 304-312 

 destructive invasions made by 



various, 339-345 

 jumping bean as exemplifying 



association of plants and, 



297, 298-300, 302 

 parthenogenetic powers possessed 



by certain, 331, 332 

 poisonous, methods of self-protec- 

 tion used by, 101, 102 

 various weapons of, 1 1 1 

 "silver-fish," depredations of, 351 

 skin burrowing, 112, 113 

 wood-boring, 346-354 



Telly-fishes, common, description of, 



58 

 fresh-water, discovery of African, 



6l, 62 

 Chinese, 63 

 Philadelphian, 63, 64 

 Regent's Park, 59, 60 

 reproduction of, 60, 6 1 

 poison-bearing threads of sea- 

 anemones and, no 

 Jumping bean, Mexican, caterpillar 



contained in, 229, 300, 302 

 movements of, 298, 299, 302 

 plant from which derived, 301, 



302 

 relationship of insect and plant 



exemplified in, 297, 298- 



300, 302 



