*De Pr<epdratione Anatomkd organorum duditus'. 229 



fus tubam Euftachianam repleac, uc, quando calore fornacis 

 ofla exficcancur, cuba a corrugacione libera aperca maneac. 

 Culcro forciori oblique aperi procejjum maftoideum, &partem 

 feperiorem> qu& os petrofum fpeciat aufer , incipiendo a cuba 

 Euftachiana usque zdfijfuram Glaferi> fic ftacim totum tympanum 

 in apricum venic. 



Recinaculo dvc carchebo includacuros cemporum,icauc 

 os pecrofum fuperius Stprocefliis maftoideus inferius dirigan- 

 tur, Hinc ferra cransverfim bis infcindacur, eo loco, ubi ner- 

 vus acufticus exic & cerebrum incrac,fic frufto oiTis incer ucram- 

 quefcifluramexemco, njeftibulum undique apercum confpici- 

 tur. Longicudine ? digici a ferra? fcifliira, verfus os cernpo- 

 rum, lima oblique dufta abradacur in ucraque parce os pe- 

 trofum donec duo femicirculi labyrinthi perforencur. 



Pars ojfts petrofi inferior , adjacens cubae Euftachianae, api- 

 ceforctoris culcri aperiacur,quo oculos incurrerepoflicc^A- 

 lea 9 cavendo ne principium feneftrse rocundae cum tympano 

 iftas fuperexpanfo pereac. Denique procejjus maftoidei pars 

 meatum auditorium confiituens , fub ofle pecrofo abfcindacur, 

 uc exigua cancum porcio meacus audicorii cumfijfura Glaferi 

 remaneac,fic in oflte pecrofo tertius labyrinthi femicirculus Iima 

 facilc decegicur : Cecerum cres labyrinchi femicirculos, immit 

 fis fecis porcinis, haud difficulcer diftinguere licebir. 



Adpleniorem Sche&atis (*Tab> III. Fig. 4.) propofici co- 

 gnicionem, haud parum conducec auris interna?, omnium- 

 que ipfius parcium accurata , fequens divifio ac diftribucio. 

 Licerae vero fingulae, fparfim admarginem appo fitde,figuram 

 refpiciunc aeri infculptam* eidemque ad explicandum, tanquam 

 fignarefpondenc. 



Ff 3 Incer- 



