The elements are sixty-four in number, of which about forty are tolerably plentiful, and therefore common; whilst the remainder, twenty-four, are rare, and for that reason of a lesser utility: whenever Nature employs an element on a grand scale it may certainly be called common, but it generally works for the common good of all, and fulfils the most important offices. [Page 86] CLASSIFICATION OF THE ALPHABET OF CHEMISTRY. 13 _Non-Metallic Bodies._ Name. Symbol. Combining proportion or atomic weight. 1. Oxygen O = 8 2. Hydrogen H = 1 3. Nitrogen N = 14 4. Chlorine Cl = 35.5 5. Iodine I = 127.1 6. Bromine Br = 80. 7. Fluorine F = 18.9 8. Carbon C = 6 9. Boron B = 10.9 10. Sulphur S = 16 11. Phosphorus P = 32 12. Silicon Si = 21.3 13. _Selenium_ Se = 39.5 51 _Metals._ 1. Aluminum Al = 13.7 2. Antimony Sb = 129 3. Arsenic As = 75 4. Barium Ba = 68.5 5. Bismuth Bi = 213 6. Cadmium Cd = 56 7. Calcium Ca = 20 8. _Cerium_ Ce = 47 9. Chromium Cr = 26.7 10. Cobalt Co = 29.5 11. Copper Cu = 31.7 12. _Donarium_ 13. _Didymium_ D 14. _Erbium_ E 15. Gold Au = 197 16. _Glucinum_ Gl 17. Iron Fe = 28 18. _Ilmenium_ Il 19. _Iridium_ Ir = 99 20. Lead Pb = 103.7 21. _Lanthanium_ La 22. _Lithium_ Li = 6.5 23. Magnesium Mg = 12.2 24. Manganese Mn = 27.6 25. Mercury Hg = 100 26. _Molybdenum_ Mo = 46 27. Nickel Ni = 29.6 28. _Norium_ 29. _Niobium_ Nb 30. _Osmium_ Os = 99.6 31. Platinum Pt = 98.7 32. Potassium K = 39.2 33. Palladium Pd = 53.3 34. _Pelopium_ Pe 35. Rhodium R = 52.2 36. _Rhuthenium_ Ru = 52.2 37. Silver Ag = 108.1 38. Sodium Na = 23 39. Strontium Sr = 43.8 40. Tin Sn = 59 41. _Tantalum_ Ta = 184 42. _Tellurium_ Te = 64.2 43. _Terbium_ Tb 44. _Thorium_ Th = 59.6 45. _Titanium_ Ti = 25 46. Tungsten W[A]= 95 47. Uranium U = 60 48. _Vanadium_ V = 68.6 49. _Yttrium_ Y 50. Zinc Zn = 32.6 51. _Zirconium_ Zr = 22.4 (N.B. The elements printed in italics are at present unimportant.) [Footnote A: From the mineral Wolfram, and now exceedingly valuable, as when alloyed with iron it is harder than, and will bore through steel.]