342 



LABORATORY GUIDE IN PHYSIOLOGY. 



FIG. 14. 



FIG. 14a. FIG. 14b. 



FIG. 14c. 



14. BINDING POSTS. Various forms are shown above. 



15. BINDING CONNECTORS. Constructed of brass and in varying 

 forms. 



FIG. 16. 



16. KEYS. a. DuBois-Reymonds key 

 b. The mercury key, as shown in figure iCa. 

 (Fig. 12K). d. The Morse key. 



FIG. 16a. 



with knife-edge contact. 

 c. The spring contact key 



