180 CONVERSATIONS ON 



What is it ?" 



" Why, the fly walks on the wall over our 

 heads ; now the air cannot press down upon 

 his feet there." 



" Yery true, boys : it cannot press down, but 

 it can and does press up against his feet ; for 

 the air presses up and down and sidewise all 

 alike." 



" Ah, now it is plain enough, and we are 

 much obliged to you, Uncle Philip, for telling 

 us what we wished to know." 



" You are quite welcome, my dear boys, to 

 all that I can teach you : if it makes you to 

 be wiser and better men when you grow up, I 

 shall be very thankful to GOD that I have 



* 



been able to do you any good." 

 " Good morning, Uncle Philip." 

 " Good day, boys ; I shall expect to see you 



all in church to-morrow." 



" We shall be there. Uncle Philip." 



