U DISEASES Class I. j. 2 . 2#. 



plate covers the aperture beneath, and is fufpended by the ex- 

 panding iponge. • This is removed every night and warned, and 

 returned into its place in the morning -, on this account it is con- 

 venient to have five or fix of them, for the fake of cleanlinefs. I 

 have been more particular in defcribing this invention, as I do 

 not know the name, or place of refidence, of the maker. 



GRD0 



