264 CHEMISTRY. 



QUESTIONS. 



356. What is said of the metal arsenic ? What is the composition of 

 ratsbane ? 357. What are the antidotes to arsenic poisoning ? 358. What 

 is said of the antiseptic properties of arsenic ? 359. What of arsenic eat- 

 ing ? 3GO. What is the composition of arsenetted hydrogen ? How is it 

 made ? What are its properties ? How delicate is this as a test for ar- 

 senic ? What is said of the danger of mistaking antimony for arsenic ? 

 361. Name some pigments containing arsenic. Of what are they com- 

 posed ? 362. What is said of the uses of antimony ? 363. Describe some 

 salts of antimony. What is tartar emetic ? 364. What is said of bismuth ? 

 365. What of its nitrate ? 366. What are the properties of copper ? What 

 its uses ? What is said of native copper ? What other ores of copper are 

 mentioned? What is said of the salts of copper ? 367. Describe an experi- 

 ment with sulphate of copper. Where and why was this done on a large 

 scale ? 368. What is a good test for copper ? 369. How is lead obtained ? 

 For what is it used ? 370. What is said of the oxides of lead ? What is 

 minium? 371. What is white-lead? How made? 372. Why is poison- 

 ing by lead so insidious? What danger is there in using lead pipes for 

 conveying drinking-water? What pipes are safer? 373. What is the sci- 

 entific name of sugar of lead ? What is its composition ? How can a lead 

 tree be made ? What is the theory of its formation ? 



CHAPTER XX. 



GROUP IX. MERCURY, SILVER, GOLD, AND PLATINUM. 



374. Mercury. This metal was thus named from its 

 quickness of movement, because Mercury was considered 

 by the ancients the most active of the gods. The alche- 

 mists called it quicksilver, because they thought it to be 

 an enchanted kind of silver, and they endeavored by vari- 

 ous processes to obtain from it solid silver. Mercury is the 

 only metal which is liquid at ordinary temperatures. It 

 freezes or solidifies at about 39-j- degrees below zero, and 

 then it is malleable like lead. It evaporates like water, 



