ADVERTISEMENT 



TO THE 



SIXTH EDITION. 



IN consequence of tlic dea.th of the former edi- 

 lor, since the publication .of the fourth edition of 

 this work in 1784, the revision of the present has 

 devolved upon me, his son. For the execution of 

 this office., he had left behind him some corrections 

 and additions, inserted in the margin of his copy 

 of the fourth edition; which, though not many, 

 have been all made use of on this occasion, from 

 a wish that the book might receive the advantage 

 of his last corrections. Such of them as he had 

 completed, had been silently adopted, but such as 

 were nothing more than mere hints, I have reduced 

 into form, and distinguished them by the initials, 

 J. S. H. and where these latter are continuations 

 of former notes, have precisely marked where they 



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