APPENDIX 



PHYSIOLOGIC APPARATUS 



The study of the physical and physiologic properties of muscles and 

 nerves necessitates the employment of some stimulus which, when appli 

 either tissue, will call forth a contraction of the muscle, or the development of 

 a nerve impulse in the nerve. The most convenient stimulus is dec naty, 

 for the reason that, with appropriate apparatus, its intensity and duration 

 can be graduated with the utmost nicety. Moreover, it does not destroy 

 the tissues, as do many chemic, physical, and mechanic stimuli. 



It is, therefore, necessary that the student JW | gWj 

 acquaintance with those appliances by means of whic. 



**&$$& aTapparL composed of different elements, which 

 by virtue of chemic actions taking place among them, generate : and co 

 electricity In its simplest form an electnc cell consists of two m< 

 zinc and copper, or carbon, or platinum, etc., immersed m an exciting fluid, 



^ThelTekmenHs 'hfoKc^on chemically by the sulphuric add 

 * With the immersion of these elements m a solution of H SO a 



formula: Zn + H 2 SO,-ZnSO. + H, 



The zinc sulphate passes into the solution, while the hydrogen accu- 



