To measure the resistance of the patient turn the lever at the left of selector on to the button =8= marked milli-ampere-meter and wire rheostat. Supposing him to have the electrodes in his hands and a current from =30= cells registers =8= milli-amperes; without changing any other conditions, throw the upper left-hand lever =10= on button marked rheostat and milli-ampere-meter only. The patient will now be thrown out and the needle will fly around as far as it can go. Begin by throwing in resistance, which is done by manipulating the top row of levers, until the needle which will have retraced its course rests directly over the division marked =8= milli-amperes or whatever may have been the previously recorded amount. The numbers on uncovered buttons added together will be the resistance of the patient. The known resistance having taken the place of the patient. _The upper left-hand lever should at all times except for purposes of measuring the resistance of a patient, be kept on its blank button, or the battery will be short circuited and injured._ THE POLE CHANGER. The pole changing lever above the two posts marked =13-13=, when pressed between the two right-hand springs makes the right-hand binding post positive, and when pressed between the two left-hand springs the left-hand post becomes positive and the right negative. GRAPHITE RHEOSTAT. When the left-hand lever is placed on button =9= it throws the graphite rheostat (=16=) into circuit. To use the rheostat first draw up the rod (=17=). By slowly pressing the rod down through the graphite it gradually lessens the resistance thereby increasing the current without shock to the patient. With this rheostat you can place any number of cells in the circuit. THE DE WATTEVILLE SWITCH. The de Watteville switch is placed directly above the pole changer is used for obtaining either the galvanic or the faradic current separately or the two combined. When the double lever rests on figure =1= and =3= the galvanic alone can be used; can when on =3= and =5= the faradic can be alone used and when on =2= and =4= the two currents are combined and used without changing the conducting cords. THE FARADIC APPARATUS. The Faradic apparatus of this cabinet combines a fast and slow interrupter also a single contact key. The style of coil used is the Du Bois-Raymond. To use =Primary= coil, place the two tips on ends of conducting cords into the two binding posts in front of the coil, the others being connected with any desired electrodes. The strength is increased by drawing the coil to the =Right=, first placing switch at right end of coil on button marked P. To use the secondary coil remove the tips of cords from primary posts; then place the ends of cords in the two binding posts =13-13= and place switch on right end of coil on button marked =S=. To increase the strength of secondary, push coil to the =Left= gradually, which is just =Opposite= to what is done in case of primary current.