ILLUSTRATIONS 21 



FIG. PAGE 



333. Tracing showing the action of digitoxin 412 



334. Tracing showing the final result of the action of digitoxin . . 413 



335. Illustration showing principles involved in construction of Ed- 



munds' liver oncometer 416 



33(3. Tracing showing the action of adrenaline 417 



.'!.'!7. Spleen oncometer made of crimped sheet brass 421 



338. Liver oncometer 42 2 



339. Tracing showing the action of tetraniethylanimonium chloride . 423 

 .">40. Arrangement of apparatus for recording tracings from an excised 



heart 425 



341. Cat's heart 426 



342. Dog's heart 427 



343. Tracing showing the final action of aconitinc . 432 



344. Tracing showing the action of veratrine 435 



345. Arrangement of apparatus for spinning a drum ... ... 436 



34(5. Tracing showing the action of veratrine 438 



347. Tracing showing the action of sodium cyanide 442 



348. Tracing showing the action of potassium cyanide 443 



349. Tracing showing the action of sodium cyanide 444 



350. Tracings showing the action of dilute sodium cyanide solution . 445 



351. Tracing showing the action of pilocarpine and /3-tetrahydronaph- 



thylamine hydrochlorkle 450 



352. Two tracings showing the action of a drug which markedly lowers 



blood-pressure 455 



353. Arrangement of apparatus for perfusion of the vessels of a brain- 



less frog 459 



354. Tracing showing the action of adrenaline sodium orthovanadate, 



amylnitrite and adrenaline 463 



355. Tracing showing the action of vanadium 464 



356. Tracing showing the action of vanadium 465 



357. Arrangement of the ligatures for isolating segments of the in- 



testine 467 



358. A schematic representation of an electric wiring system .... 471 



359. Foot bellows 472 



360. Diagrammatic representation of an artificial respiration machine 473 



361. View of system of pulleys used to operate the interrupting valve 474 



362. Lever gate valve 474 



363. Diagram showing method of operation of lever gate reversing 



valves ' . 475 



364. Portable artificial respiration machine 475 



365. Special form of interrupting valve 476 



366. Special interrupting valve 477 



367. A motor driven long paper kymograph 478 



368. Detailed view of one plan of construction of the speed regulating 



device for the kymograph 479 



369. Motor driven long paper kymograph 480 



370. Hand drill 481 



371. Blast lamp 482 



372. Details of the mechanical construction of an adjustable tambour 483 



373. A large bowled tambour 484 



