ttESCRtPTION OF A SCARIFICATOR. Jgjj; 



Without any intention then extravagantly to extol the This instm- 

 properties of a new instrument, or unnecessarily to depre- ™^^' ^"®*^' 

 ciate the merits of an old one, I take the liberty of recom- 

 mending one to my medical brethren for their approbation, 

 which I have found to answer in ray hands much better than 

 any other that I have yet been able to procure. That the 

 instrument here recommended will invariably produce the 

 wished for eifect, I am sanguine enough to believe ; at the 

 same time that I, by no means, mean to assert it is not stili 

 capable of farther improvement. 



A draught taken by Mr. Mac Donald, a friend and pupil 

 of mine, is subjoined, sufficiently explanatory as I hope of 

 the fabric of the instrument, which may be purchased of 

 Mr. Winter, Cutler, Bridge Street. 



It is my intention, at no very distant period, to offer a ' 



few observations on the formation and number of the lancets, 

 so as more inamediately to adapt them to particular parts of 

 the body. 



Explanation of the Plate. 



Plate IV, fig. 1, 2, and 3. a a nut, by means of which, The scarffict- 

 actiug on the screw h, the plates c and d, holding the Ian- tor describad, 

 cets, are drawn upwards, till the catch e falls into the 

 notch at^ The nut is then unscrewed ; and, by pushing 

 in the knobg-, the catch is withdrawn, and the worm spring 

 ii immediately forces down the lancets. 



i, a spring acting on the catch e, to force it into the 

 notch. 



k, a box, which, by means of the screws//, regulates 

 at will the exposure of the lancets, and in consequence the 

 depth of the incisions. 



The figures are on a scale of half an inch to an inch. 



V. 



