INDEX 



XX} 



Rooks, why do they repair their 



nests in autumn 740 



Rook, adaptations of the bill and 



stomach 743 



Rooks, why are they frequently 



accompanied by starlings ... 993 

 Rope-dancing, why is the eye im- 

 portant in 120 



Ruminantia, roo-me-nan'-xhe-a ... 507 

 Ruminating animals, digestive 



organs explained 509 



Rumination, how conducted ... 510 

 Ruminating animals, why have 



they cloven feet 512 



Ruminating animals, why are 



many furnished with horns ... 525 

 Salmon, why do they arrive earlier 



in some rivers than in others ... 1063 

 Salmon, why do female, ascend the 



rivers before the males when 



spawning 1064 



Salmon, why do they halt in 



brackish water 1066 



Salmon, why is the flesh red ... 1067 

 Sand-eel, why ho* it a projecting 



jaw 1090 



Sand-launce, why has it a project- 

 ing jaw 1090 



Sauria, saw'-re-a, why is the 



order of reptiles so called ... 1008 

 Savage tribes, how are the heads 



of, flattened 93 



Scansores, skan-so' -recs, why is 



the third order of birds so termed 794 

 Scansores, why also called zygo- 



dactyli 796 



Scent in dogs 272 



Scent, why is a moist atmosphere 



best for 274 



Scent, why is a wet day unfavour- 

 able for 276 



Scent, why is there little when the 



ground is hard and dry 277 



Scent, why does it sometimes lie 



breast high 278 



Scent, why does it rarely lie with 



a north or east wind 279 



Scent, state of, indicated by the 



manners and attitudes of dogs... 280 

 Scent, why good when the wind is 



southerly 281 



Scent, why does humidity favour 



its transmissioa 282 



Scent, why seldom good when 



cobwebs hang on bushes ... 283 



Scent, why will it sometimes be 



good in a hard rain and mild 



air 281 



Scent, why destroyed by sudden 



storms ... 285 



Scent, why not good on sunshiny 



days ... ... ... ... ... 286 



Scent, why good on a warm day 



without sunshine 287 



l?eent, why does it lie badly upon 



fallows and roads 288 



Scent, why good by hedgerows ... 289 

 Bct-nt, why does it differ in various 



breeds of dogs 290 



Sea, why is it sometimes lumLious llil 



Sea, why does it contain saline 

 matter 1153 



Sea-birds, why are they able to 

 breast the waves 940 



Sea-horse, why has it a pouch in 

 its abdomen 1115 



Sea-horse, why has it a pointed 

 tail i 1117 



Seals, why classed among car- 

 nivora 324 



Seals, why they abound in estu- 

 aries and straits 326 



Seal-hunters, why do they place 

 themselves near holes in the 

 ice 323 



Seals, why are the nostrils of sur- 

 rounded by hairs 330 



Seals, why their nostrils close 

 habitually 332 



Seals, why their eyes are peculiarly 

 developed 333 



Sea-wolf, peculiar structure of the 

 jaw 627 



Secretary bird, why are its wings 

 tipped with hard points 682 



Secretary bird, why esteemed in 

 America 683 



Seeing, why do its powers depend 

 greatly on exercise 113 



Seeing, why erroneoxis to suppose 

 that the eye takes in many near 

 objects at once 114 



Selachia, see-lftck'-e-a, why is the 

 fifth order of fishes so called ... 1124 



Senses, why placed in the head ... 112 



Serpents, why have they no feet... 1018 



Serpents, how are they able to 

 move without legs 1019 



Serpents, why may they fall from 

 trees without injury 1020 



Serpents, why have they the power 

 of fascination 1024 



Shanny, why does it hide behind 

 stones and rocks 1083 



Sharks, why do they follow ships 1128 



Sharks, why have their eggs long 

 filaments attached 1129 



Sheep, why do they make a 

 nodding motion of the head ... 570 



Sheep, why do they follow each 

 other even into danger 572 



Sheep, why is their upper lip 

 divided 574 



Sheep, wild and tame, why less 

 difference between, than between 

 wild and tame cattle 575 



Sheep, why so much bleating 

 among, after shearing 641 



Shepherd's dog, why are its habits 

 the result of training, and not 

 instinct 296 



Shrike, why called the sentinel ... 687 



Shrike, why called the butcher- 

 bird 689 



Sight, why essential to the firm- 

 ness of the body 113 



Sight, in old age, why are spec- 

 tacles necessary 123 



