... ( 2 35 ) 
with a Rag, then wipe the Plate clean, and you will fee your Defign very plain. 
The Plate is then fit to fend to the Rowling-Prefs for a Proof, after which, any 
common Hand may putin a few Strokes with a Graver, in Cafe there be found any 
little Deficiencies. 
Thus have I given as much, and no more, on the Subject of Etching , than I 
have difcovered from my own Practice and Experience. There are, I believe, 
many of my Countrymen, who could give far better Inffrudtions in this Art than 
myfelf; but fome of them, perhaps, are Idle, and others interefted to keep it fecret. 
I know of none that have advanced any Thing worth naming, on this Subjedt, in our 
Language, but what is tranfiated from fome other. ’ 
As there was no Defign at the Beginning of this Work to have carried it on to the 
Length it is now come, the Matter contained in it could not be ranged in a Claflicai 
Order; for as Things of a mixed Nature continually offer’d themfelves to me, I was 
obliged to proceed juft as I could procure Subjects to go upon: Therefore, if we 
furvey this whole Work (which is now brought to a Conclufion) we fhall find many 
Subjedts that ought to have been placed together, are fcattered throughout the four 
Parts thereof j and as their being fo creates fome Difficulty and Confufion, I have 
judged it convenient to bring all the Subjedts contained in the Book, into a Generical 
Catalogue , by which Means one may find all the Subjedts that belong to the fame 
Genus ranged by themfelves, and pointing to the different Plates of the Book where 
they are figured and defcribed ; which Method will be found more ready and ufeful 
for the turning to any particular Subjedt contained in this Book, than an Alphabetical 
Catalogue of Names could have been. 
A CAT A- 
