228 MICROSCOPIC ANATOMY OF THE TEETH 



impregnated with a very weak solution of gold chloride 

 (1 in 5,000), being reduced in alkalis. 



As shown by the author in several communications (22), 

 this method, as first employed, demonstrated nerve fibres 

 in connexion with the medullated fibres of the pulp passing 



!, W 



o z 6 



FIG. 138. Pulp of human premolar prepared by the Weil process. 

 Stained borax carmine, o. Odontoblasts ; z. odontogenic zone ; b. blood- 

 vessels ; n. nerve trunks ; w. basal layer of Weil. ( x 50.) 



in extraordinary abundance to the dentine and entering the 

 tubes ; it also revealed an intricate plexus of neurofibrils 

 between and around the odontoblasts. The ' end cells ', how- 

 ever, were not shown in these preparations, and only appeared 

 when the modified method, above described, was adopted. 

 The basal layer of Weil. Professor Weil (34) of Munich 

 described a layer or space which lies immediately beneath 

 the odontoblast layer (fig. 138), and which is especially 



