xxii 



QUESTIONS FORMING A COMPLETE INDEX. 



LESSON LXI. 



Rainbow colours, why do glass 

 lustres and chandeliers exhibit 



them 498 



Rainbows, why are the colours of 

 the secondary bow fainter than 



those of the primary 491 



Ratnbow, what is a lunar 492 



Rainbow, why is a lunar bow faint- 

 er than the solar 493 



Rainbow, why is one in the morn- 



ing the shepherd's warning ... 538 

 Rainbow, why is one at night the 



shepherd's delight 539 



Refraction of light, what is it ... 472 

 Refraction and reflection of light, 



what is the difference 502 



Reflections, why are they reversed 490 

 Reflection, why do black bodies re- 



fiVct any light 505 



Reflection, why does a window- 

 pane appear to reflect better by 



night than by day 516 



Reflection, what is the line of ... 520 

 Reflection, what is the angle of ... 522 



Repulsion, what is it 792 



Respiration, why does the chest 



expand when we breathe ... 889 



Respiration, how does blood com- 

 municate with the air in the 



lungs ' ... 890 



Rest, why does it invigorate us ... 1018 



Rice, where is it cultivated 1219 



Rosewood, what is it 1191 



LESSON LXII. 



Saliva, why does saliva enter the 

 mouth while we are eating ... 872 



Sea, why is it salt 764 



Sea, what is the estimated amount 

 of salt in the ... 765 



Sea, what is the depth of the ... 766 



Sea-gulls, why are they numerous 

 in fine weather 1119 



Sen-gulls, why do they fly over the 

 land on the approach of stormy 

 weather 1120 



Sea-crow, why is its lower bill 

 longer than the upper 1135 



Sealing-wax, why does rubbing it 

 attract to it small particles of 

 matter 565 



See, why do we 963 



Seeds, why are they generally en- 

 veloped in hard cases ... ... 1152 



Seeds, why do they throw out roots 

 before they form leaves 1153 



Seeds, why does the leaf-germ 

 come up to the light and the 

 root-germ penetrate the earth ... 1285 



Seeds, why are they indigestible ... 1286 



Soe-saw, why may a little boy bal- 

 ance a larger boy , 863 



See-saw, why dot's the littlii boy 

 sink to the 'anh, \vhpii the larger 

 buy kicks tlie ground 801 



LESSON LXIII. 

 See-saw, why may the little boy 



keep the larger one up, when 



once he is up ......... 864 



Shadows, what is the cause of ... 508 

 Shadows, why is there some light 



where shadows fall ...... 510 



Shadows, why do they lengthen as 



the sun goes down ......... 526 



Shuttle-cock, why does it travel 



slowly through the air ...... 836 



Shuttle-cock, why do we hear a 



noise when we strike it with the 



battledore ............ 837 



Sight, why are two persons able to 



see each other ......... 551 



Sight, why can we see so many 



upon the small retina ...... 966 



Sight, why are we able to see at 



long or short distances ...... 974 



Sigh, why do we ......... 1025 



Silica, what is it ......... 1260 



Silk, what is it ............ 1200 



Skin, why does a chill of the produce 



inflammatory action in the lungs 1014 

 Sky, what is it ............ 5:50 



Sky, why is it red at sunset ... 532 



Sleet, what is it ......... 447 



Sleep, what is it ......... 1019 



Smell, why do wfl ......... 992 



Smoke, what is it ......... 102 



Smoke, why is there so little when 



the fire is red ... ...... 105 



Smoke, what is it ......... 289 



LESSON LXIV. 

 Smoke, why do fresh coals in- 



crease the quantity of ...... 



Smoke, why does it issue in folds 



and curls ............ 



Smoke, why does it ascend in mild 



and fine weather ......... 



Snails, why can they move in an 



inverted position ... ... ... 



Snails, where do they obtain their 



shfills ................ 



Snails, why do their shells grow ... 

 Snails, why are their shells spiral 

 Snails, why have they four tenta- 



cula attached to their heads ... 

 Snails, why are they able to move 



without feet ......... 



Snails, why do we see none in the 



wintertime ... ...... 



Snails, why can they live in sealed 



Sneeze, why do we ......... 



Snipes and woodcocks, why have 



they long, tapering bills ...... 



Snore, why do we ......... 



Snow, why does it keep the earth 



warm ............... 



Snow, why is it a good non-con- 



ductor of heat ... ...... 



Snnw, what is it ....... .. 



Snow, why is it white ..... 



2P1 

 632 

 689 

 666 



1-506 

 1307 

 1308 



1309 

 13JQ 

 13H 



1312 

 1024 



1042 

 1028 



ICO 



]f>2 

 4^0 

 41; 



