The Reason Why. Robert Kemp Philp

why does it beat without any effort of the will, 948

       Heart, why is it placed in the chest of the body, 932

       Heart and lungs, why are they enclosed by ribs, 933

       Heart, why are its motions made independent of the will, 950

       LESSON XXXVI.

       Heat, what is it, 71

       Heat, what are the properties of, 86

       Heat, what is animal, 87

       Heat, what is latent, 88

       Heat, what is a conductor of, 108

       Heat, what is a non-conductor of, 109

       Heat, how is it transmitted from one body to another, 119

       Heat, what is the radiation of, 114

       Heat, what is the reflection of, 115

       Heat, what is the absorption of,116

       Heat, what is the convection of, 117

       Heat, what is the cause of the sensation, 134

       Heat, what becomes of that which the hearth-stone receives, 136

       Heat, how long does a substance feel hot or cold to the touch, 139

       Hearth-rug, and hearth-stone, their relative states of heat, 142

       Heat, which are the better conductors, fluids or solids, 146

       Heat, why are dense substances the best conductors, 147

       Heat, why are fluids bad conductors, 148

       Heat, why are woollen fabrics bad conductors, 149

       Heat, is air a good or bad conductor, 150

       LESSON XXXVII.

       Heat, is water a good or a bad conductor, 151

       Heat, how do we know that air is not a good conductor, 155

       Heat, how do we know that water is not a good conductor, 156

       Heat, why are bottles of hot water wrapped in flannel, 158

       Heat, why are hot rolls wrapped in flannel, 159

       Heat, what is the highest degree that man can bear, 176

       Heat, why may man endure a high degree without injury, 178

       Heat, why may we believe that the internal heat of the earth does not arise from terrestrious combustion, 224

       Heat, what is the radiation of, 181

       Heat, what becomes of that which is radiated, 186

       Heat, when does a body radiate it, 184

       Heat, does the movement of the air affect the radiation of, 188

       Heat, why will not the motion of air disturb the rays of, 190

       Heat, what bodies are good radiators of, 192

       Heat, what bodies are bad radiators of, 193

       Heat, why does water keep hot longer in a bright metal jug, 195

       LESSON XXXVIII.

       Heat, may it be reflected, 210

       Heat, are light or dark-coloured bodies the best reflectors, 211

       Heat what bodies are the best reflectors of, 212

       Heat, why is that which is reflected less intense than the primary, 214

       Heat, can it be reflected in any great intensity, 215

       Heat, are good reflectors also good absorbers, 216

       Heat of the sun's rays, how is it diffused, 219

       Heat, how do we know that it is absorbed by the earth, 222

       Heat, do plants absorb it, 225

       Heat, how is it diffused through the atmosphere, 232

       Heat, how is it diffused through the ocean, 233

       Heat, why is it developed during chemical changes, 312

       Heat, what are the sources of, 323

       Heat, what is the accepted theory of, 328

       Heat, what is the point at which it becomes luminous, 545

       Heat,