QUESTIONS FOEMINO A COMPLETE INDEX. 



LESSON XVII. 



Clothing, are conductors or non- 

 conductors the warmer ... 121 



Clothing, why are white and light- 

 coloured articles cool 218 



Clothing, why are dark-coloured 

 dresses worn in winter, and light 

 in summer 230 



Clouds, what are they 873 



Clouds, why do we not see them 

 ascend 375 



Clouds, why are they invisible 

 when they rise, but become 

 visible when they have ascended 376 



Clouds, why do they not descend 

 to the earth 377 



Clouds, at what altitudes do they 

 fly 378 



Clouds, how many descriptions 

 are there 879 



Clouds, what produces their 

 various shapes 380 



Clouds, what are their dimensions 381 



Clouds, how are they affected by 

 winds 382 



Clouds, what do Cirrus foretell ... 389 



Clouds, what do Cumulus foretell 390 



Clouds, what do Stratus foretell ... 391 



Clouds, what do Nimbus foretell 392 



Clouds, what do Cirro-cumulus 

 foretell 393 



Clouds, what do Cirro-stratus fore- 

 tell 394 



Clouds, what do Cumulo-stratus 

 foretell 395 



LESSON XVIII. 



Clouds, why are cloudy days 

 colder than sunny days 396 



Clouds, why are cloudy nights 

 warmer than clear nights ... 397 



Cloudy days and nights, why are 

 they not always wet 432 



Clouds, why are they white ... 531 



Clouds, why are they sometimes 

 yellow 533 



Clouds, what developes the elec- 

 tricityinthe 581 



Clouds, why do they sometimes 

 move towards each other from 

 opposite directions 778 



Clouds, why do they gather around 

 mountain tops 781 



Cloves, where are they produced 1231 



Coal, what is it ... 271 



t'oal, why do we know that it is 

 of vegetable origin 273 



Coal, what are the chemical com- 

 ponents of 274 



Coals, why do they produce yellow 

 flame 279 



Cockles, why have they stiff mus- 

 cular tongues 1087 



Cocoa, what is it 1195 



Cocoa, what tree produces it ... 1221 



Coffee-pot, why has it a wooden 

 handle ... .. 125 



LESSON XIX. 



Coffee, what is it 1193 



Coffee, where is it cultivated ... 1224 



Cohesion, what is the attraction of 776 

 Coke-fires, why do they not give 



flames 107 



Coke, what is it 278 



Cold, when is a body said to be 78 

 Cold, what is the cause of the sen- 

 sation 133 



Cold, does it radiate 207 



Colour, why is a substance white 46a 



Colour, why is a substance black 467 



Colour, why is a rose red... ... 4<3S 



Colour, why is a lily white ... 469 



Colour, why is a primrose yellow 470 

 Colour, why are there so many 

 varieties of colour and tint in 



nature 471 



Colours, remarks upon 501 



Combustion, what takes place 



during 48 



Combustion, how many kinds are 



there 93 



Conductors of heat, what sub- 

 stances are good 110 



Conductors of heat, why do bad 



conductors readily ignite ... 295 



Combustion, what is spontaneous 311 

 Combustibles used for lighting, 



which vitiates the air most ... 62 



Conduction of heat, what is the 11 3 

 Convection, what is the chief effect 



of the law of 243 



LESSON XX. 



Cork, what is it 1271 



Cork-tree, why does it shed its 



own bark 1272 



Corns, why when they ache may 



rain be expected 1115 



Corn, why does the young ear 



come up enfolded in two leaves 1167 



Cotton, what is it 1199 



Cough, why do we 1023 



Crickets, why do they make a 



chirping noise 1123 



Cross -bills, why do their man- 

 dibles overlap each other ... 1136 

 Cup in a pie, why does it become 



filled with juice 631 



Cup in a pie, does it prevent the 



juice from boiling over 662 



Dates, what are they produced by 1221 



Death-watch, why does it make a 

 ticking noise .-. 1301 



Dew, what is it 345 



Dew, what causes the decline of 

 temperature which produces it 347 



Dew, why is there little or none, 

 when the nights are cloudy ... 348 



Dew, why does it form most abun- 

 dantly on cloudless nights ... 349 



Dew, why is there little under the 

 branches of thick foliage ... 357 





