( 4* ) 



and many fplendid pieces of fcenery. Air is likewife 

 employed with great fuccefs, on different occafions ; not 

 only for the purpofes above-mentioned, but likewife to 

 form artificial and complicated echoes : fome repeating 

 the motion of the feet ; fome the ruftling of garments ; 

 and others the human voice, in many different tones : 

 all which are calculated to embarrafs, to furprize, or to 

 terrify the paffeoger in his progrefs. 



All forts of optical deceptions are alfo made ufe of; 

 fuch as paintings on prepared furfaces, contrived to vary 

 the reprefentations as often as the fpectator changes placer 

 exhibiting, in one view, groupes of men; in another, 

 combats of animals ; in a third, rocks, cafcades, trees and 

 mountains; in a fourth, temples and colonades; and a 

 variety of other pleafing fubjecls. They likewife contrive 

 pavements and incruftations for the walls of their apart- 

 ments, of Mofaic work, compofed of many pieces of 

 marble, feemingly thrown together without order or 

 defign; which, when feen from certain points of view, 

 unite in forming lively and exadr, reprefentations of men, 



L animals-* 



