VOLTAIC ELECTRICITY. 263 



figure, the direction of the current, (d.) What are the electrodes ? 

 (e.) Indicate them by their proper signs upon the figure. 



2. (a.) Describe or figure a high resistance battery of Grove's ele- 

 ments. (&.) A low resistance battery of Bunsen's elements, (c.) 

 What is the peculiar advantage of the Daniell's battery ? 



3. (a.) Describe an experiment illustrating the heating effects of 

 current electricity. (6.) Describe the Voltaic arc. 



4. (a.) How may a very feeble current be detected ? (&.) Describe 

 the apparatus used, (c.) Mention the features contributing to its 

 delicacy. 



5. (a.) How may a fire poker be temporarily magnetized with a 

 magnet ? (&.) Without a magnet ? (c.) When temporarily magnet- 

 ized without a magnet, what kind of a magnet does the pokei 

 become ? (d .) State the principle of the electric telegraph. 



6. (a.) How may an electric current be induced ? (b.) What about 

 the continuity of an induced current? (c.) Show how a magnet 

 may produce the same effect as an electric current, (d.) Dees this 

 show that there is a fundamental connection between magnetism 

 and electricity ? (e.) Do the theories of magnetism and electricity 

 connect satisfactorily the phenomena of magnetism and electricity ! 



7. (.) What have we to show that there really is a fundamental 

 connection between heat and electricity ? (&.) Compare the Leyden 

 battery, the Voltaic battery, and the lightning-flash with reference 

 to their effects. 



8. (a.) Define electrolyte. (&.) What term is applied to chemical 

 decomposition when effected by means of an electric current ? (c.) 

 How would you go about the task of determining for yourself the 

 electro chemical nature of a substance ? 



Recapitulation. In this section we have studied 

 Electricity as produced by Chemical Action ; the 

 Electric Current and Circuit, and Electrodes; 

 Voltaic Batteries; Amalgamating Battery 

 Zincs ; the Thermal and Luminous Effects 

 of current Electricity, including the Electric Light ; 

 the deflection of the magnetic needle and the Galvan- 

 ometer ; Electro-Magnets and the Telegraph ; 

 Electrolysis ; Electro-plating, and Electro- 

 typing; the Physiological effects; Induced cur- 



