‘ 
6, 
‘An improved Inflrument for drawing Teeth. 4% 
From the defeription that has been given of the pro- 
cefs, 0 perfon can be at any lofs in reforting to the 
fame -kind of fumigation. It is only neceffary to obferve, 
for the fake of thofe who may not be verfant in chemical 
‘parfuits, that the ingredients ought to be pure, and that 
‘metal veffels or rods muft not be employed. Any kind of 
metal getting among the ingredients would caufe the vapour e 
to be very noxious, inftead of falutary. The fumes that rife 
fhould be white; if they are of a red colour, there is reafon 
to fufpeét the purity of the ingredients. 
The importance of this difcovery need not be infifted on: 
it is equally applicable to every {pecies of putrid contagion, 
even to the plague itfelf. It fhould therefore be ufed in all 
hofpitals and parifh workhoufes ; and fhould be conftantly 
reforted to by the proprietors of all large works, on the firft 
appearance of infectious difeafe among the people employed 
in them :—indeed, it fhould be employed even as a preven- 
tive in all fituations, where a number of people, from the 
nature of their bufinefs, are obliged to be crowded together, 
or where, from local circumftances, there are reafons for 
fufpecting that the purity of the air is injured by noxious 
exhalations or other caufes’ If there be any circumftances 
in which its utility might be called in queftion, it can only 
be in cafes of inflammatory difeafes ; for, in fuch, fuperoxy- 
genation has been found hurtful. 
————— 
XIV. Defcription of an improved German Key for extra&ing 
Teeth. By Mr, Cxarzes Brown, Surgeon. Commu- 
nicated by the Inventor. 
Tue obfervations with which you accompanied the 
announcement of my improvement in your laft number, 
renders any introduction to the defcription of the inftrument 
unneceflary. 
The handle A (Plate II.) is made of ivory, very large and 
heavy, with the view of giving greater purchafe to the ope- 
trator. Bis 
