12 ILLUSTRATIONS 



25. Dorsal View of the Human Tongue 112 



26. Vertical Section of a Fungiforra Papilla 113 



27. Vertical Section of a Vallate Papilla 114 



28. Lateral View of a Catfish Showing Gustatory Branches of the 



Facial Nerve 116 



29. A Simple Taste-bud 117 



30. A Compound Taste-bud 118 



31. Taste-buds of the Rabbit 121 



32. Taste-buds of the Cat 122 



33. Taste-buds of the European Barbel 124 



34. Diagram of the Human Tongue Showing Innervation 125 



35. Diagram of the Possible Paths of the Gustatory Nerves in Man. . . . 126 



36. Diagrams of the Human Tongue Showing the Distribution of the 



Four Tastes 149 



37. Diagrams of the Receptor Systems of the Vertebrate Chemoreceptors 181 



