5*8 



PHYSIOLOGICAL PHYSICS. 



Dalton's law, 288 



Damping chamber for galvano- 

 meter, 106 



Daniell's element, 19 



Danish balance, 497 



Dark lines of solar spectrum, 321 



Decoction of madder,- Fluores- 

 cence of, 337 



Decomposition by diffusion, 251 



of a vibration into' two at 



right angles, 401 



of light, 319 



Degenerative reactions of Erb, 

 163 



Densimeter of Rousseau, 20$ 



Density, Electrical, 5, 25 



of gas, 273 



of liquids, 197 



, , Methods of estimating, 



198 et seq. 



, , Relation of to pressures 



194 



Derived currents, 32 



Deriving cushions, 112 



Desormeaux, Endoscope of, 355 



Despretz' experiments on com- 

 pressibility of gas, 272 



Dextro-rotatory, 413 



Diabetes, Specific gravity of urine 

 in, 204 



, Use of saccharimeter in, 145 



Diagnosis, Electricity for, 159 



Dialyser, 261 



Dialysis, 260 



Diamagnetic, 94 



Diathermancy, 335 



Diathermanous, 462 



Dicrotism, 225 



Difference of potential, 13 



- of tones, 433 



Differential galvanometer, 108 

 Diffusiometer, 280 



Diffusion affected by galvanic 



current, 258 



, Decomposition by, 251 



images, 383 



of albumen, 259 



of gases, 288 



through porous septa, 



290 



- of liquids, 248 



Dip of magnetic needle, 93 

 Direct vision prism, 330 



spectroscope, 330 



Discharger, Electric, 12 

 Dispersion of light, 320 

 Dissonance, 432 



Diverging lens (see Concave), 315 

 Divided circuits, 32 



Dobbie and Hutchison's method 



for estimating sp. gr., 200 

 Dollond, 346, 359 



Donders on anomalies of refrac- 

 tion, 389 



Double refraction, 397 

 Doublet, Wollaston's, 358 



for achromatic lenses, 361 



Doubly refractive substances, De- 

 tection of, 404 

 Drawing of micro'scopic objects, 



371 

 Droinograph of Lortet and Chau- 



veau, 233 



Dropsies, Mechanism of, 267 

 Du Bois-Reymond : 



electrodes, n6n-polarisable, 

 111, 119 



- (platirium), 61 

 friction-key; 55 

 galvanometer, 99 

 iuductorium, 42 



modified by Helmholtz,47 



modification of Poggendortt's 



compensation method, 120 

 modified frog-interrupter, 129 

 modified spring myograph, 176 

 muscle telegraph, 63 

 rheocord, 77 

 round compensator, 125 

 Duchenne, 159 

 Dufay, 3 



Dulong, Calorimeter of, 482 

 , experiments on gaseous pres- 

 sure, 272 

 Dut rochet, 251 

 Dynamics, General, 485 et seq. 



of sitting, 511 



of walking, etc., 511 



Dynamometer, 4S9 



Ebullition, 473 



, Point of, 471 



Eckard, 256 



Efflux, Velocity of, 208 



Elastic force of gas, 270 



tubes and flow of liquids, 220 



Electric attraction and repulsion, 5 



battery of galvanic cells, 24 



of Leyden jars, 12 



condensers, 11 



density, 5 



discharger, 12 



induction, 34 



potential, 13 



signal, 172 



tension, 6 



Electrical machines, 8 

 Electricity, Conductors of, 4 



