. The Cambridge natural history. Zoology. 390 FISHES The physiological reason cVitre of the connexion between the air-bladder and the auditory organ cannot yet be regarded as satisfactorily determined. It is possible, as Weber thought, that it may be an auxiliary to the he-. tna n. Fig, 223.âDiagram to show the function of hearing by trans- mitting to the ear sound-waves impinging on the surface of the body and affecting the gases in the air-bladder.â * On the other hand, it may be urged with perhaps greater probability that the connexion exists for the purpose of conveying
. The Cambridge natural history. Zoology. 390 FISHES The physiological reason cVitre of the connexion between the air-bladder and the auditory organ cannot yet be regarded as satisfactorily determined. It is possible, as Weber thought, that it may be an auxiliary to the he-. tna n. Fig, 223.âDiagram to show the function of hearing by trans- mitting to the ear sound-waves impinging on the surface of the body and affecting the gases in the air-bladder.â * On the other hand, it may be urged with perhaps greater probability that the connexion exists for the purpose of conveying to the ear stimuli due to the varying degrees of distension of the air-bladder, such as, it may ossicles and their relations to the ear ijg presumed, are naturally and the air-bladder. aU Atrium, an â *- â¢^ extension of the sinus impar ; , brought about by the Varia- anterior vertical canal ; , bony wall of fiâ,,â âf T,,T^â«r,4-âj-;â the periotic capsule ;, the medianly- ^^°'']^ °^ hydrOStatlC pressm'e united endolymphatic ducts; , hori- wllich a Msll encOUllters in zontal canal ; in, Intercalarium, a third .i p -j - ossicle imbedded in the ligament (Ug) ^"6 COUrSe ot its aSCent Or connecting the scaphium with the descent in the water.^ Whether tripus ; n, bony uodnles on the sides of -, -, the complex vertebral centrum ; , regarded as an aCCeSSOry tO posterior vertical canal; s. saccuius; hearing. Or as a means of regu- sc, scaphium ; , sinus endolymph- i ⢠, ,. aticus; , sinus impar; ilea, the latmg the distonsion of the anterior and crescentic parts of the air-bladder, the physiological tripus ; ut, utnculus. The radial lines c jo represent the fibres of the dorsal wall of Value of the Connexion must Saddou.')""^^"'' '^""^ ^"''^' '"'^ be considerable, and on this point it is at least significant that the Weberian mechanism is characteristic of the dominant families of freshwate
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
