SUBSTANCES BY THE BLOW-PIPE. 221 



5. !■'«— Ma« — Co — &c., remain iu the bead, i>. 115. 



If the b(!ii(l .s]neuil.s out on the Ch, it must bocoUoctod to a globule by coiitiimcd blowiujc. 

 Make 'i borax bead on platlnuiu wiru, and dis.solvi; in it some of the ii■agnleut^^ of the bead, reserving 

 the rest for accidents. 



c. J\i — Cm— Ag — Ah— Sbj — Pb— Ea are reduced and collected by the lead but- 

 ton. Su, I'b, Bi, if present, will Ik: partly volatilized, p. 115. 



Keraove the lead button from the bead wliilo hot, or by breaking the latter, when cold, on the anvil 

 between papisi', carefully preserving all the fragments. 



(I. If Co is present, the bead will be blue. 



tf a large amount of Fe is i)resent, add a little /borax to prove the presence or absejce of <"o, p. 



If Mil is iirescnt, the bead, wl)on treated on platinum v.'ire in the O. F., will become dark violet or 

 black. 



e. If only Fe and Mu with no Co are present, the bead will be almost colorless. 



Look here for Cr, Ti, Mo, U, W, V, Tn by the wet way. 



A considerable amount of Ti may be detected with S. Ph, and tin in the original oxides, in ab.scnce of 

 other non-reducible coloring oxides, p. 323. Mo will be shown by the cloudy brown or black appear- 

 ance of the borax bead in the K. F. on platinum wire, p. 105. 



/. Tiv.it Ihe button c on Ch, in tlie O. F. until all the lead, &,c. is driven off; Ni, 

 Cm, Ay:, Ah remaining behind ; or separate the lead with boracic acid, p. 442. 



(/. Treat the residue </ on Ch, in O. F. with S. Ph bead, removing the button while 

 the bead is hot. 



h. If Ni and Ch are present, the bead will be green when cold, p. 292. If IVi 

 only, yellow. If Cm only, blue. 



Prove Ch by treating with tin on Ch in tlie R. F., p. 293. 



i. For A^ and Au make the special test No. 8. 



B. Ti:i;.vTMENT of the second poution.— Drive off the volatile substances in the 

 O. F. on Ch. Treat with the R. F., or mi.x with soda, and then treat with the R. F., 

 for Zai, Cd, Sh. If a white coating is formed, test with cobalt solution, pp. 251, 

 256, 27G. Note, p. XV. 



C TitE.iT.MENT of THE TiiuW) fOHTiox.— Dissolve some of the substance iu S. Ph 

 on platinum wire in O. F., observing whether Si O- is present or iiot, and test for Mu 

 with nitrate of potassa, p. 210. 



3. Test for As with soda on Ch, in the; R. F., or with dry soda in a closed tube, p. 

 345 ef seq. 



4. Dissolve in S. Ph on platinum wire in the O. F., (if the substance is not metallic 

 and does not contain any S.,) and test for SB> on Cli with tin in the R. F., p. 99. To 

 detect small amounts of Sb with Cu or Sn, see p. 'Sol. 



5. Test for Se on Ch, p. 368. 



6. In absence of Se fuse with soda in the R. F., and test for S on silver foil, p. 365, 

 In presence of Se, test for S in open tube, p. 360. To di.stingui.sh between S and 

 SO-', see p. 363. 



7. Test foi- lis: with dnj soda in a closed tube, p. 304. 



8. Mix some of the substance with as.say lead and borax glass, and fuse on Ch in 

 the R. F., p. 401. Cupel the lead button for Ag., p. 407. Test with nitric acid for 

 Au, p. 320. 



9. Test for CB, Br, and I with a bead of S. Ph saturate-d with oxide of copper, pp, 

 373, 374, 375. 



10. Test for CI or Br wifli bisu][)hate of potassa, ]>. 374. 



11. Test for HO in a clo.sed tube, p. 3.53. 



12. Test on platinum wire, or iu platinum pointed forceps, for coloration of the 

 flame, p. 72 e/ seq. 



13. Test for CO= with hydrochloric acid, p. 360. 



14. Test for ]\'0^ with bisulpliate of potassa, p. 351, 



15. Test for Te in an o^jen tube, p. 351, 



