Xll 



CONTENTS OF THE FIRST VOLUME. 



The skin as the organ of touch, 427 ; 



aided by the muscular sense, 428 

 Examples of the local concentration of 



the sense among the lower animals, 



428 

 Experiments of Weber on its rela- 



tive 

 429 



acuteness in different parts, 



Power of estimating weight, 431 

 Heat and cold, 432 



Duration of impressions of touch, 433 

 Subjective sensations of touch, 433 



CHAPTER XY. 



INNERVATION, CONTINUED. 



Of TASTE, 434 



Structure of the mucous membrane of 



the tongue, 434 

 Chorion, papillae, and epithelium of the 



tongue, 435 



Simple and compound papillae, 436 

 Circumvallate papillae, 437 

 Fungiform papillae, 437 

 Conical or filiform papillae, 438 

 Nerves of the papillae, 440 

 Functions of the papillae, 441 



Gradations of papillary structures, 441 



Precise seat of taste, 442 



Nerves of taste, 443 



Conditions of taste, 445 



Do taste and touch co-exist in any of 



the papillae ? 446 

 Are the varieties of taste referable to 



the varieties of the papillae 1 447 

 After-tastes, 447 

 Subjective phenomena of taste, 448 



