The Reason Why. Robert Kemp Philp

       Clothing, why do some articles feel cold, and others warm, 120

       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, 373

       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, 379

       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 foretell, 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 develops the electricity in the, 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

       Coal, why do we know that it is of vegetable origin, 273

       Coal, what are the chemical components of, 274

       Coals, why do they produce yellow flame, 279

       Cockles, why have they stiff muscular 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 sensation, 133

       Cold, does it radiate, 207

       Colour, why is a substance white, 466

       Colour, why is a substance black, 467

       Colour, why is a rose red, 468

       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 substances 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, 113

       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 mandibles 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 abundantly on cloudless nights, 349

       Dew, why is there little under the branches of thick foliage, 351

       LESSON XXI.

       Dew,