33. Myrrh 129 34. The trees which produce myrrh 130 35. The nature and various kinds of myrrh _ib._ 36. Mastich 132 37. Ladanum and stobolon _ib._ 38. Enhæmon 134 39. The tree called bratus 135 40. The tree called stobrum _ib._ 41. Why Arabia was called “Happy” 136 42. Cinnamomum. Xylocinnamum 137 43. Cassia 140 44. Cancamum and tarum 141 45. Serichatum and gabalium 142 46. Myrobalanum _ib._ 47. Phœnicobalanus 143 48. The sweet-scented calamus; the sweet-scented rush 144 49. Hammoniacum _ib._ 50. Sphagnos 145 51. Cypros 146 52. Aspalathos, or erysisceptrum _ib._ 53. Maron 147 54. Balsamum; opobalsamum; and xylobalsamum _ib._ 55. Storax 151 56. Galbanum 152 57. Panax _ib._ 58. Spondylium 153 59. Malobathrum _ib._ 60. Omphacium _ib._ 61. Bryon, œnanthe, and massaris 154 62. Elate or spathe 155 63. Cinnamon or comacum _ib._ BOOK XIII. THE NATURAL HISTORY OF EXOTIC TREES, AND AN ACCOUNT OF UNGUENTS. 1. Unguents—at what period they were first introduced 159 2. The various kinds of unguents—twelve principal compositions 160 3. Diapasma, magma; the mode of testing unguents 166 4. The excesses to which luxury has run in unguents 167 5. When unguents were first used by the Romans 168 6. The palm-tree 169 7. The nature of the palm-tree 170 8. How the palm-tree is planted 172