250 



SPECIAL SENSES. 



dilute hydrochloric acid, their structure is readily observed. 

 They are abundantly supplied with blood-vessels and nerves. 



FIG. 20. 



1, 1, circumvallate papillae; 2, median circumvallate papilla, which entirely fills the foramen 

 caecum ; 3, 3, 3, 3, fungiform papillae ; 4, 4, filiform papillse ; 5, 5, vertical folds and furrows 

 of the border of the tongue ; 6, 6, 6, 6, glands at the base of the tongue ; 7, 7, tonsils ; 8, 

 epiglottis ; 9, median glosso-epiglottic fold. (SAPPEY, Traite tfanatomie, Paris, 1871, tome 

 iii., p. 617.) 



Taste-Buds, or Taste-Beakers. A few years ago, Loven 



