xxvi 



QUESTIONS FORMING A COMPLETE INDEX. 



LESSON LXXVII. 



Wheat, what is the northern limit of 1235 

 Wheat, why is silica diffused over 



its stem 1261 



Wheat-crops, why do they greatly 



exhaust the soil 1263 



Whirlwinds, what are they ... 678 



Why do we see 963 



Why do we wink 975 



Why do we weep 977 



Why do we hear : 983 



Why do we taste 986 



Why do we smell 992 



Why do we feel 1004 



Why do we sleep 1019 



Why do we dream 1020 



Why do suppers produce dream- 

 ing ... ... 1021 



Why do we yawn 1022 



Why do we coueh 1023 



Why do we sneeze 1024 



Why do we sigh 1025 



Why do we laugh 1026 



Why do we hiccough 1027 



Why do we snore 1028 



Why do we feel hungry 1337 



Why do we feel thirsty 1338 



Wick of a candlo, why does it turn 



Hack as it burns 225 



Wick of a candle, why is there a 



ppark generally at the end of it ... 256 



Will-o'-the-wisp, what is it 318 



Winds, what is the cause of ... 234 



Winds, why are east usually dry ... 384 



Winds, why are west usually wet... 385 

 Winds, why are north usually cold 



and dry 386 



LESSON LXXVIII. 



Winds, why are south warm and 

 rainy ... ... ... ... ... 387 



Wind, what is it 660 



Winds, what are the velocities of ... 667 



Winds, what are trade 668 



Winds, what is the cause of trade 669 



Winds, why do trade winds blow 

 from east to west 670 



Winds, what determines the char- 

 acter of 674 



Wind-mills, why do their wings 

 turn round 690 



Windows, why do they reflect the 

 sun's rays in the evening ... 523 



Windows, why do they not reflect 

 the sun's rays at noon 524 



Wood, why does decayed look 

 luminous - 95 



Wood, burning at one end, why 

 does it not feel hot at the other 118 



Wood, why is it a bad conductor 

 of heat 119 



Wood that is grern, why does it 

 hiss and steam when burning ... 285 



Wood, why does it ignite less read- 

 ily than paper 297 



Woodcocks and snipes, why have 

 they nerves running down to the 

 tip of their bills 104? 



Woodpeckers, why do they " tap'' 

 at old trees 1066 



Woollens, why are they worn in 

 winter 168 



Wool, what is it 1201 



Yawn, why do we 1026 



Zoological geography 133ft 



