AVENUES. 381 



But the width between the trees C and D will seem 

 to be no more than E F. 



Q. In a long straight STREET, WHY do the 

 houses seem to APPROACH NEARER and nearer as 

 they are more DISTANT ? 



A. Because the more distant the 

 houses are, the more acute will be the 

 angle which any two make with our eye. 



Thus in the last figure 



If A and B were two houses at the top of the street, 

 the street would seem to be as wide as the line AB : 



And if C and D were two houses at the bottom of the 

 street, the street at the bottom would seem to be no 

 wider than E F. 



Q. In an AYENTTE of TREES, WHY do they 

 seem to be SMALLER as their distance increases ? 



A. Because the further the trees are 

 off, the more acute will be the angle 

 made by their perpendicular height with 

 our eye. 



*"' B 



Here the first tree A B will appear the height of the 

 line AB ; but the last tree C D will appear only as high 

 as the line E F. 



