A POPULAR GUIDE TO THE TERMS 



ART AND SCIENCE. 



ACCOUNTS. 



Au'dit. — The settling of accounts by examining documents and 



hearing parties concerned ; a final account. 

 Book-keeping. — The art of recording mercantile transactions 



in a regular and systematic manner. 



AIR. 



Aerodynam'ics (Gr. atr, air, and dunamis, power). — The 

 science which treats of the motion of the air, and its me- 

 chanical effects whou in motion ; also its resistance to bodies 

 moving in it. 



Aerog'nosy (Gr. ae?-, air, and gnosis, knowledge). — The science 

 wliich treats of the properties of air, and the part it per- 

 forms in the operations of nature. 



Aerol'ogy (Gr. aer, air, and lo(jios, description). — A descrip- 

 tion of the air ; that branch of philosophy which treats of 

 the air, its constituent parta, properties, and phenomena. 



Aerom'eter (Gr. aer, air, and metron, measure). — An instru- 

 ment for ascertaining the density or rarity of air. 



Aerom'etry (Gr. aer, air, and metreo, I measure). — The art 

 of measuring the air, so as to ascertain its pressure or 

 weight, its elasticity, rarefaction, etc. 



Aeronaut'ics, Aerosta'tion (Gr. aer, air, and nautes, a 

 sailor). — The doctrine, science, or art of sailing in the air 

 by means of a balloon. 



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