xx LIST OF ILLUSTRATIONS. 



FIG. PAGE 



275. The curves show alteration in excitability produced by the vapours of 



chloroform, ether, and alcohol (Waller) ..... 536 



276. Effect of faradisation upon the electrical response of nerve (Waller) . 537 



277. Excitatory variations in fresh and stale nerves (Waller) . . . 539 



278. Influence of C0 2 upon the response from "stale" nerve (Waller) . 530 



279. To illustrate internal polarisation in a moist conductor . . . 541 



280. Internal polarisation around metallic core of Hermann's model . . 542 



281. effects in such a model as Bering's . . . 542 



282. Extrapolar polarisation currents on opening polarising current . . 544 



283. Spread of current into extrapolar regions ..... 546 



284. Electrotonic effects of constant current ..... 546 



285. Development of electrotonic currents (du Bois-Reymond) . . 548 



286. Helmholtz's experiment on rate of electrotonic propagation . . 549 

 287-289. Influence of excitation upon electrotonic effect . . 550, 551, 552 



290. After-effects of polarising current ...... 556 



291. Electrical organ of skate. Longitudinal section .... 563 



292. , Diagrammatic view, to show the structure of 



a disc ......... 564 



293. Curve of development of excitatory effects in torpedo organ . . 577 



294. Excitatory effects shown with capillary electrometer . . . 578 



295. Self-excitation of torpedo organ . . . . . .579 



296. Self- excitation of Malapterurus organ ..... 580 

 297-299. Experiment with 580, 581 



300. Evolution of sensory cell (G. Retzius) ..... 593 



301. Nerve cell from the electric lobe of torpedo (M. Sclmltze) . . 595 



302. cells of Hirudo (Apathy) ...... 596 



303. Spinal ganglion cell showing intracellular network of fibrils (C. Golgi) . 597 



304. Nerve cell of annelid (Apathy) ...... 597 



305. Diagram of a nerve cell to show the Nissl granules (Cajal) . . 599 



306. Illustrates the "law of axipetal conduction" in motor nerve cells 



(Cajal) ......... 606 



307. Illustrates the supposed lines of conduction in a spinal ganglion cell 



(Cajal) 606 



308. Shows the relative number of the synapses in the visual and and itory 



organs (G. Retzius) ....... 610 



309. Variations of sympathetic nerve distribution .... 630 



310. Diagram of course of a grey ramus ..... 631 



311. Relations of nerve roots to lumbar and sacral vertebrae . . .631 



312. Diagram to show variation in nerVe origin .... 632 



313. Nerve cell connections of abdominal lymphatic .... 647 



314. Left pelvic plexus of cat . . . . . . .666 



315. Mechanism of pseudo-reflexes ...... 679 



316. Reflexes and pseudo-reflexes ...... 680 



317. To illustrate certain connections of pre- and post-ganglionic fibres . 681 



318. Experiment of joining the cut vagus and sympathetic in the neck . 691 



319. Method of recording voluntary contraction-curve . . . 707 



320. Tracing of a voluntary contraction of the thumb muscles . . 707 



321. Part of a similar tracing, taken on a faster surface and with the move- 



ments more amplified ..... 708 



322. Vibrations of the outstretched arm holding a weight (W. Griffiths) . 708 



323. Myographic curves from hamstring of monkey (Horsley and Schafer) . 709 



324. tracings obtained from stimulation of different parts of the 

 motor path (Horsley and Schafer) . 710 



325. Period of latent excitation on stimulation of the cortex cerebri, and 



