VOL. XLI.] PHILOSOPHICAL TRANSACTIONS. 52Q 



into which the needle is put, and the point comes out at the end ^ of an inch. 

 This is to be introduced into the eye at the orifice the other needle had made ; 

 when it is so far introduced, as the end of the tube is within the posterior 

 chamber of the aqueous humour, the needle is to be withdrawn, leaving the 

 tube in the eye ; and then, with the mouth, may be sucked into the tube, all 

 the blood, and watery humour that is contained there, or any other floating 

 particles ; then the tube is to be withdrawn, and the eye left to replenish itself 

 with the aqueous humour again ; which will take but 12 or 18 hours at most. 



The foUoiuing Instruments are proposed to remedy some kinds of Deafness pro- 

 ceeding from Obstructions in the external and internal auditory Passages. 



In order to discover with more exactness, whether the disorder lies in the 

 outward ear, Mr. C. made use of a convex glass, 3 inches in diameter, fixed in 

 a handle, (fig. 8) into which is lodged some wax candle, which comes out at a 

 hole near the glass, and reaches to the centre; which, when lighted will dart 

 the collected rays of light into the bottom of the ear, or to the bottom of any 

 cavity that can be brought into a straight line ; therefore, when it is discovered 

 by the help of this glass, and lighted candle, that the ear is full of hard wax, 

 which will not bear to be taken out with the forceps, the method is to have a 

 small boiler, containing some proper herbs ; and by difl^erent tubes of various 

 sizes, the steam is conveyed to the bottom of the ear. In a short time, the 

 wax will dissolve, and the person find great ease. In one of these tubes, are 

 placed 2 valves, to regulate the heat to the person's inclination. If this has not 

 the desired effect, and the person still remains deaf, the following instruments 

 are made to open the Eustachian tube. If, upon trial, it should be found to 

 be obstructed, the passage is to be lubricated, by throwing a little warm water 

 into it, by a syringe joined to a flexible silver tube, which is introduced through 

 the nose into the oval opening of the duct at the posterior opening of the nares, 

 towards the arch of the palate. The pipes of the syringe are made small, of 

 silver, to admit of bending them, as occasion offers; and, for the most part, 

 resemble small catheters : they are mounted with a sheep's ureter (fig. 9) ; the 

 other end of which is fixed to an ivory pipe ; which is fitted to a syringe, by 

 which warm water may be injected : or they will admit to blow into the Eusta- 

 chian tube, and so force the air into the barrel of the ear, and dilate the tube 

 sufficiently for the discharge of the excrementitious matter that may be lodged 

 there. The probes, (fig. 10) which are of the same shape with the pipes, have 

 small notches near the points, which take in some of the hardened and gluti- 

 nous matter, contained in those tubes, which is distinguished by the fetid smell, 

 when the probes are withdrawn. 



VOL. VIII. 3 Y 



