xlii COMPARATIVE ELECTRO-PHYSIOLOGY 



FIG. PAGE 



355. Experimental Arrangements for Showing so-called Polarisation- 



increment by the Joint Effect of Increased Excitability at Anode 

 and Enhanced Conduction of Excitation electrically Uphill. 

 Direction of Current in this is Reversed . . . . . 574 



356. Photographic Record of Responses in Nerve of Fern, under Anodic 



and Kathodic Action as described in Figs. 354 and 355. - '. ; ; i 575 



357. Photographic Record of Similar Effects in Nerve of Frog . :..". . 575 



358. Make-kathode and Break-anode Effects in Biophytiim . . 579 



359. Effect of Anode and Kathode on Responsive Sensation in Human 



Hand , . . . . / >. . -. 582 



360. Polar Effects of Currents due to Localised Application on Upper 



Half of Pulvinus of Erythrina indie a . . . . . 589 



361. Experimental Arrangement for Magnetometric Method of Record . 594 



362. Photographic Record of Uniform Magnetic Responses of Iron . . 594 



363. Photographic Record of Periodic Groupings in Magnetic Responses 594 



364. Photographic Record of Response and Recovery of Steel under 



Moderate and strong Magnetic Stimulus . . . . . 595 



365. Photographic Record showing Ineffective Stimulus made Effective by 



Repetition . . .... . . . .. . . 595 



366. Molecular Model . . . / . . . ... 598 



367. Method of Resistivity Variation . . . . ... 600 



368. Photographic Record of Response of Aluminium Powder in Sluggish 



Condition to Stimulus of Electric Radiation . . . .601 



369. Photographic Record Showing Uniform Response of Aluminium 



Powder to Uniform Stimulus of Electric Radiation . . . f . 602 



370. Photographic Record of Response of Tungsten . . . ; . 603 



371. Experimental Arrangement for obtaining Response in Iron by In- 



duction Current . . ...... . . . 604 



372. Magnetic Conductivity Balance ....... 607 



373. Process of Balancing illustrated by Photographic Record of Responses. 608 



374. Effect of K- and A-Tonus on Magnetic Conduction . . . 609 



375. Opposite Effects of K-Tonus when moderate and strong . . . 610 



376. Effects of K- and A-Tonus on Magnetic Excitability . . . 611 



377. Gradual Enhancement of Conductivity by the Action of Stimulus . 612 



378. Characteristic Curve of Iron under increasing Force of Magnetisation 620 



379. Characteristic Conductivity Curve of Sensitive Metallic Particles be- 



longing to Negative Class, under increasing Electro-motive Force . 621 



380. Cyclic Curves of Magnetisation and of Conductivity . . . 622 



381. Photographic Record of Magnetic Tetanisation of Steel, exhibiting 



Transient Enhancement of Response on Cessation . . . . 623 



382. Mechanical Response of Frog's Nerve to successive equal Stimuli, 



applied at Intervals of One Minute . . . ... 625 



383. Mechanical Response of Frog's Nerve, showing Conversion of Ab- 



normal Positive into Normal Negative Response after Tetanisation 627 



384. Photographic Record showing Conversion of Abnormal ' Down ' Re- 



sponse in Tin to Normal ' Up,' after Tetanisation . . . . 628 



