PLATE XXIII. 



FIG. 169. 



FIG. 170. 



Lobule of Liver. 



Uriniferous Tubes of Kidney. 



FIG. 173. 



Tactile Papillae. 



Blood-vessels of Kidney. 



FIG. 174. 



FIG. 172. 



Alveoli of Lung. 



