VI CONTENTS. 



PAGE. 



38. Tin 204 



39. Titanium 207 



40. Zirconium 212 



41. Thorium 214 



42. Gallium ' 21S 



43. Indium 219 



44. Cerium 220 



45. Lanthanum 229 



46. Didymium 236 



47. The Yttrium Group. Scandium, Yttrium, Ytterbium, Erbium, Ter- 



bium, Phillipium, Decipium, Thulium, Samarium, etc 240 



48. Columbium (Niobium) 247 



49. Tantalum 248 



50. Platinum 249 



51. Osmium 254 



52. Iridium 255 



53. Palladium 256 



54. Rhodium 258 



55. Ruthenium 259 



Appendix 261 



