374 



SUBJECT INDEX 



Stapes, motion, 278, 279, 280, 281 



muscle, 277, 281 

 Step wedge absorption, 37 

 Sterilamp, 140, 167 

 Sterilization, of air, 167 



of surgical operating area, 167 



of water, 165 



with ultraviolet radiations, 165, 167 



with x-rays, 34 

 Stimulating electrode, 213 

 Stimuli, 211 



electrical, 212 



inadequate, 223 



subliminal, 223 

 Subsidence coefficient of nerve, 234 

 Sulphanilamide, 182 

 Summation tones, 302 

 Sun, radiation from, 134, 140 

 Sunlight, 133 

 Sunlight Lamp, radiations from, 137, 



140, 141 

 Surface energy, 171, 175 



aqueous solutions, 175 



defined, 172 



effects of impurities on, 186 



liquid-liquid, 174 



of living systems, 176 



of spreading cells, 178 



temperature effect, 173 

 Surface membrane, 170 

 Surface properties, 171 

 Surface structure, 170 



Tanning mechanism, 137 

 Tectorial membrane, 284, 286, 287 

 Temperature coefficient of water, 186 

 Tensiometer, suspended ring, 185, 186 

 Tensor tympani, 263, 269, 275 

 Thermionic equation of Richardson, 2, 5 

 Thimble ionization chamber, 45, 46 

 Threshold, of feeling, 266, 288 



of hearing, 266, 288 

 Thyroid gland, 95 

 Tissues, absorption of gamma rays by, 71 



action of x-rays, 32, 35 



mild erythema, 33 



penetration of x-rays, 32 '-■ 

 Tolerance, x-ray dose, 36 

 Tones, difference, 300 



summation, 300 



Transient equilibrium, 62 

 Translucence of human tissue, 26 

 Transmission factor, 150 

 Transmissivity, 145, 151 

 Transmutation, artificial, 87-96 



Curie-Joliot's experiment, 89 



Rutherford's experiment, 87, 88 

 Transparency, of eye media, 117 



of human sweat, 146 



of skin, 137 

 Traube stalagmometer, 184 

 Tungsten x-ray spectrum, 8 



general radiation, 9, 31 



K series, 8, 9, 11 



L series, 11 



M series, 11 



target, 8 



target x-ray tube, 3, 4 

 Tympanic cavity, 261 

 Tympanic displacements, 265, 266 

 Tympanic membrane data, 262, 263 

 Tympanic tensor, 269, 275, 281 



Ulcer, duodenal, 38 



Ultraviolet absorption, by air, 139, 166 

 by bacteria, 160, 166 

 coefficients, 144 

 content of sunlight, 134 

 by proteins, 158 

 spectra, of adenine, 147 



of cystosine, 147 



of egg albumin, 146 



of ergosterol, 161 



of guanine, 147 



of human epidermis, sweat, 146 



of plants, 166 



of pseudoglobulin, 146 



of serum albumin, 146 



of thymine, 147 



of thymus nucleic acid, 147 



of water 166 



Velocity of nerve impulses, 220, 222 

 Victoreen condenser r-meter, 45, 46 

 Virucidal effects of ultraviolet radiations, 



160 

 Visibility curves of eye, 117 

 Visual acuity, 124, 126 

 Vitamin A content, of cod-liver oil, 159 

 retina, 159 



