" 287 



dum tubulo mobili tegitur. Ifl maximis cartilagineorum pifcium nari- 

 bus valvula magna etiam adefi Hanc fabricam ad aquam naribus 

 receptam motu agitandam et renovandam efTe necefTariam in pifcibus, 

 utpote non refpirantibus, cenfebat Camper. Opufcul. I. p. 16. Partis II. 

 Huc trahere operculum narium ab Ariftotele de Anima II. 9. memora- 

 tum conatus eft Schneider de Catarrhis libro III. Aliam rationem iniit 

 Severini Zootom. p. 124. Uterque tamen a fenfii philofbphi aberra- 

 vity ut infra de nervis pifcium demonftrabo. 



Addam fufpicionem viri docli propofitam in libro egregio : An 

 Eftaij on comparative Anatomy^ London 1744. ubi p. 1 27 de pifcium 

 odoratu ita tradit: Their organ of fmelling is large, and tliey have a 

 power of contracling anddilating the entry into thcir nofe as they have 

 occafion — m confequence of their fmell being the principal mean 

 they have of difcovering their food , we may frequently obferve their 

 allowing themfelves to be carried down with the ftream that they may 

 afcendagain Ieifurely againft the current of the water. Thus the odorous 

 particles fwimming in that medium being applied more forcibly to theic 

 finelling organs produce a flronger fenfation. 



Calorem aquae tantum, quantum in aere quadrupedes homines- 

 que facile ferunt, pifces fine magna noxa vitaeque adeo periculo non 

 fuftifrent. Variae tamen exftant virorum doclorum narrationes de 

 pifeibus aquis calidis innatantibus j percas enim in Libyae thermis vi- 

 diffe teftatur Schaiu ; m eodem orbe ad urbem Cafza Gallus DesFon- 

 taines thermas ad gradum 30 menfiirae Reaumurianae incalefcere 

 vidit , nihilo tamen minus pifces quidam iis innatabant. Hiftoria 

 aquarum mineralium Lucae cyprinos loquitur calorem aquarum fin- 

 guini humano parem ferentes; eandem rem teflantur Valisnieriy 

 Conring et Anderfon. Denique Sonnerat aquas ad gradum ufque 

 69 menfurae Reaumurianae incalefcentes pifcium feraces vidit. Reliqui 

 fcriptores menfuram caloris juftam non afTerunt , aut plane nullam ; 

 (genus etiam pifcium obfcure defignant) Contra Mufchenbroek gra- 

 dum r 1 1 menfurae Fahrenheitianae pifcibus letalem putabat; percam 

 vegetam minutorum horae 3 fpatio exfpirare vidit in gradu caloris g6 y 

 cum antea in gradu 72 bene valuitTek- 



Judicium de graducaloris dirficillimumreddit varietas, quam anni 

 tempora et forma organorum refpirationis diverfa afferunt. Experi- 

 menta a Cl. Broufjomt inftituta pauca funt. Aquas fiuviales gradatim 



' caiefecit, 



