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THE NERVES AND SENSATION-PRODUCTION AND PROPAGATION OF SONOROUS

MOTION—EXPERIMENTS ON SOUNDING BODIES PLACED IN VACUO-ACTION OF HYDROGEN ON THE VOICE-PROPAGATION OF SOUND THROUGH AIR OF VARYING DENSITY — REFLECTION OF SOUND — ECHOES — REFRACTION OF SOUND-INFLECTION OF SOUND; CASE OF ERITH VILLAGE AND CHURCH --INFLUENCE OF TEMPERATURE ON VELOCITY - INFLUENCE OF DENSITY AND ELASTICITY-NEWTON'S CALCULATION OF VELOCITY-THERMAL CHANGES PRODUCED BY THE SONOROUS WAVE-LAPLACE'S CORRECTION OF NEWTON's FORMULA-RATIO OF SPECIFIC HEATS AT CONSTANT PRESSURE AND AT CONSTANT VOLUME DEDUCED FROM VELOCITIES OF SOUND-MECHANICAL EQUIVALENT OF HEAT DEDUCED FROM THIS RATIO-INFERENCE THAT ATMOSPHERIC AIR POSSESSES NO SENSIBLE POWER TO RADIATE HEATVELOCITY OF SOUND IN DIFFERENT GASES — VELOCITY IN LIQUIDS AND SOLIDS-INFLUENCE OF MOLECULAR STRUCTURE ON THE VELOCITY OF SOUND.

MHE various nerves of the human body have their

1 origin in the brain, and the brain is the seat of sensation. When you wound your finger, the nerves which run from the finger to the brain convey intelligence of the injury, and if these nerves be severed, however serious the hurt may be, no pain is experienced. We have the strongest reason for believing that what the nerves convey to the brain is in all cases motion. It is the motion excited by sugar in the nerves of taste which, transmitted to the brain, produces the sensation of sweetness, while bitterness is the result of the motion produced by: aloes. It is

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