SCIENTIFIC READINGS. 127 



350. What is an Electrophorus, and explain the mode 

 of exciting it ? 



351. Why are points so generally to be avoided in 

 electrical apparatus ? 



352. What is an Electrometer ? 



353. Who was it that first identified electricity with 

 lightning ? 



354. What are Paratonneres, and what is expected 

 from their use ? 



355. On what principle does the action of the Elec- 

 trophorus depend ? 



356. What are Conductors, and explain the principle 

 of their action ? 



35? There are certain fishes that are capable of giving 

 electrical shocks ; required their names, and designate 

 that which is the most powerful. 



358. When may electricity be employed as a medical 

 agent ? 



3c 9. Required the accepted difference between Gal- 

 vanism and Voltaism. 



360. By what means did Galvani first discover that 

 action which received the name Galvanism ? 



361. Who was Galvani, and who Volta ? 



362. Which are the best metals for producing Voltaic 

 action ? 



363. Describe a Voltaic pile, and the manner in 

 which it should be erected. 



364. Who first invented the Galvanic trough ? 



365. What is the best mixture to produce Voltaic 

 action ? 



366. Describe a galvanic battery and the effects capa- 

 ble of being produced by it. 



367. If a piece of zinc be placed under the tongue, and 

 a piece of silver between the lips and gums near the eye- 

 tooth, and the two metals be brought into contact, a flash 

 will be perceived ; required the cause of the flash ? 



368. There are certain facts of common occurrence 

 referred to Galvanism, relate them. 



369. May the nature of Electricity and Galvanism be 

 said to be thoroughly understood I 



