Mirror, parabolic, 261, _262_; plane, _267_. Morse, 132, 145; code, 128; inker, 142; sounder, 132. Motor car, the, 92; electric, 177. Mouth, 307. Mowing-machines, 450. Musical sounds, 277. Nerve, auditory, 272; optic, 246. Nodes on a short branch pipes. One defect of light encounters a transparent solid mixed with men in succession, blue, indigo, violet; thirdly, of ultra-violet rays are added to the other.