64. How an estimate is formed of the age of animals from their teeth 60 65. The tongue; animals which have no tongue. The noise made by frogs. The palate 61 66. The tonsils; the uvula; the epiglossis; the tracheal artery; the gullet 62 67. The neck; the throat; the dorsal spine 63 68. The throat; the gullet; the stomach 64 69. The heart; the blood; the vital spirit _ib._ 70. Those animals which have the largest heart, and those which have the smallest. What animals have two hearts 65 71. When the custom was first adopted of examining the heart in the inspection of the entrails 66 72. The lungs: in what animals they are the largest, and in what the smallest. Animals which have nothing but lungs in the interior of the body. Causes which produce extraordinary swiftness in animals 67 73. The liver; in what animals, and in what part there are two livers found _ib._ 74. The gall; where situate, and in what animals it is double. Animals which have no gall, and others in which it is not situate in the liver 68 75. The properties of the gall 69 76. In what animals the liver increases and decreases with the moon. Observations on the aruspices relative thereto, and remarkable prodigies 70 77. The diaphragm. The nature of laughter _ib._ 78. The belly: animals which have no belly. Which are the only animals that vomit 71 79. The small guts, the front intestines, the anus, the colon. The causes of the insatiate voracity of certain animals _ib._ 80. The omentum: the spleen; animals which are without it 73 81. The kidneys: animals which have four kidneys. Animals which have none _ib._ 82. The breast: the ribs 74 83. The bladder: animals which have no bladder _ib._ 84. The womb: the womb of the sow: the teats 75 85. Animals which have suet: animals which do not grow fat _ib._ 86. The marrow: animals which have no marrow 76 87. Bones and fish-bones: animals which have neither. Cartilages 77 88. The nerves: animals which have none _ib._