OP SENSATION, AND THE ORGANS OP THE SENSES 

 Fig. 200. 



A. Compound papillae on the side of the foramen caecum, injected : a, a. Arterial twigs, v, v. Veins. The 

 capillary loops indicate the simple papillae ; in one of which, b, the injected matter has been extravasated 

 within the basement-membrane of the papillae, the outline of which is thus distinguished, c. Capillary 

 plexus, where no papillae exist. e } e. External surface of the epithelium of the papillae. Magnified 15 

 diameters. 



B. One of the simple papillae of A : a, v, v. Arterial and venous sides of the capillary loops, b, b. Basement- 

 membrane, d. Deeper epithelial particles resting on the basement-membrane, s. Scaly epithelium on the 

 surface. Magnified 300 diameters. 



Fig. 201. 



A. Fungiform papilla, showing the secondary papillae on its surface, and at a its epithelium covering them 

 over. Magnified 35 diameters. 



B. Another, with the capillary loops of its simple papillae injected, a. Artery, v. Vein. The groove around 

 the base of some of the fungiform papillae is here represented as well as the capillary loops, c, c, of some neigh- 

 boring simple papillae. Magnified 18 diameters. 



ject considerably from the surface, and are usually narrower at their base than 

 at their summit. They contain a complex capillary plexus (Fig. 202), the 

 terminal loops of which enter the numerous simple papillae that clothe the sur- 

 face of the fungiform body. Amidst these lie nerve-tubes, which probably 

 have a looped arrangement j 1 and the epithelium which covers them is so thin 

 as to allow the red color of the blood to be seen through it. In this manner, 



1 The Author, in conjunction with Messrs. Bowman, T. Wharton Jones, and Kiernan, 

 has most carefully examined the mode of termination of the nerves in the fungiform papil- 

 lae, with the view of testing the validity of the assertion of Dr. Waller (" Phil. Trans.," 

 1849) that they have free truncated extremities. No such terminations, however, could 

 be exhibited to them by Dr. Waller ; and the conclusion at which they arrived as most 

 probable, has been already stated (g 343). 



