APPENDIX. 



BY THE TRANSLATORS. 



§ 1. The first section of the Appendix should, according to promise, 

 have been constituted of an exposition of the views which we have taken 

 with regard to the Cell-theory. Finding, however, that it would be 

 inexpedient to extend this already somewhat voluminous work by the 

 amount of space and number of illustrations which would be necessary for 

 a more complete discussion of the subject than has already appeared 

 in the pages of the "British and Foreign Medico-Chirurgical Review" 

 (October, 1853), we must refer the reader to the article in question. 



We hope, however, in the course of a short time, to treat of the whole 

 subject at length in another place. 



Corpuseiila tactus and Pacinian bodies. — In an essay on this sub- 

 ject, contained in the " Quarterly Journal of Microscopical Science," 

 for October, 1853, we have endeavored to show that papillae which 

 contain ^^ corpuscula" may also possess a vascular loop, and that there 

 is, at any rate, no inverse relation between nerves and vessels in the 

 papillre, since in the Frog, the terminations of the nerves in the fungi- 

 form papillae of the tongue, first described by Dr. Waller ("Phil. Trans.," 

 1848), take place in obviously vascular papillae. We regard the " cor- 

 pusculum" as no peculiar body, but simply as embryonic connective 

 tissue, differing from that of the rest of the papilla only in the regular 

 arrangement of its elastic element ; it is, in fact, the dilated termination 

 of the neurilemma of the nerve of the papilla. 



With regard to the mode of termination of the nerves, while not 

 venturing to deny the existence of loops, we doubt it ; on the other 

 hand, repeated instances of the so-called free termination of dark-con- 

 toured nerve-tubules on the surface of the corpuscula are described and 

 figured (1. c, p. 3, Fig. 4). The termination is not really "free," inas- 

 much as the tubules become continuous, both here and in the Frog's 

 tongue, with the imperfect, reticulated, elastic fibrils of the papillae. 



As respects the Pacinian bodies, we stated, at that time in opposition 

 to all authorities, that their central portion is solid and not hollow, and 

 that in Birds and in the human hand, the fluid supposed to exist be- 



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