P R O C E S S, &c. 777 



notwithstanding its utility and importance has 

 been hitherto ncgleded by chcmiib. 



ii. The different Sorts of Bricks. 



MANY arc of opinion that bricks, fuch as arc 

 made at prcfent are too porous aud fpungy, and 

 arc much inferior to the bricks of the ancients. 

 I myfelf have fecn brick-walls crumble down 

 within a few years after they were creeled ; yet 

 it is not uncommon to fee a brick-wall retain all 

 its original ilrmnefs and folidity after having 

 flood a century or two. I mean not, however, 

 to fpcak here of bricks for building common 

 walk. Thcfc mud be very bad indeed, if they 

 will not lail for a number of years when properly 

 cemented and plaiftcred ; and this latter circum- 

 ilancc I am to conlider at length clfewherc. But 

 forchimnics and other parts of buildings of which 

 the materials are required to be folid, bricks or tiles 

 ought to be prepared by the proccfs of which I 

 am about to give a detail. Care muft full be 

 taken, however, *o have the roof formed of du- 

 rable materials, as a protection from the weather 

 and from accidents. Wooden roofs are very im- 

 proper, they are very liable to catch fire, and 

 they occafiun the woods to be cut down before 

 reaching their full growth. Turf is no lefs un- 

 i'uitable ; the ufe of it caufes the meadows to 

 be ravaged, and befide*, other materials are nc- 



ceiTary 



