LIST OF ILLUSTRATIONS. 



XXXI 



FIGURE 



540. Hypermetropic eye, . . . 



541. Power of accommodation, . 

 *542. Diagram of astigmatism (Frost), 



543. Cylindrical glasses, 

 *544. Scheme of the nerves of the iris (Erb), 

 *545. Pnpilometer (Gorham), 

 *546. Pupilometer (Gorham), . . . 



547. Entoptical shadows, 



548. Scheme of the original ophthalmoscope, . 



549. Scheme of the indirect method, 



550. Action of a divergent lens, . . 



551. Action of a divergent lens, 



552. View of the fundus oculi, . . 

 *553. Morton's ophthalmoscope (Pickard and Carry), 

 *554. Frost's artificial eye (Frost), 

 *555. Action of the orthoscope, 

 *556. Mariotte's experiment, . 

 *557. Horizontal section of the right eye, 

 *558. M 'Hardy's perimeter (Pickard and Carry), 

 *559. Priestley Smith's perimeter (Pickard and Carry), 



560. Perimetric chart, . 



561. Geometrical colour cone, 



562. Action of light rays on the retina, 

 *563. Cones of the retina (Stirling after Engelmann), 

 *564. Irradiation, . . . 

 *565. Irradiation, 



566. Scheme of the action of the ocular muscles 



567. Identical points of the retina, 



568. The horopter, . . 



569. Two stereoscopic drawings, 



570. Wheatstone's stereoscope, 



571. Brewster's stereoscope, 



572. Telestereoscope, . . 



573. Wheatstone's pseudoscope, 



574. Rollett's apparatus, 

 *575. Zollner's lines, 



576. Section of an eyelid, 



577. Scheme of the organ of hearing, 



578. External auditory meatus, 



579. Left tympanic membrane and ossicles, 



580. Membrana tympani and ossicles, 



581. Tympanic membrane from within, 

 *582. Ear specula (Krohne and Sesemann), 

 *583. Toynbee's artificial membrana tympani (Krohne and Sesemann), 



584. Right auditory ossicles, 



585. Tympanum and auditory ossicles, 



586. Tensor tympani and Eustachian tube, 



587. Right stapedius muscle, 

 *588. Eustachian catheter, 

 *589. Politzer's ear bag (Krohne and Sesemann), 



590. Right labyrinth, . 



591. Scheme of the cochlea, 

 *592. Interior of the right labyrinth, . 

 *593. Semicircular canals, 

 *594. Section of the macula acustica (Ranvicr), 



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