Human Frame. 249 



the whole mass of bloed is said to be 

 about twenty-five pounds, so that a quan- 

 tity of blood equal to the whole mass of 

 blood passes through the heart fourteen 

 times in one hour ; which is about once 

 every four minutes-" Consider what an 

 affair this is when w T e come to very large 

 animals. The aorta of a whale is larger 

 in the bore than the main-pipe of the 

 water-works at London-Bridge ; and the 

 wat,er roaring in its passage through that 

 pipe, is inferior in impetus and velocity 

 to the blood gushing from the whale's 

 heart. Hear Dr. Hunter's account of the 

 dissection of a whale. u the aorta mea- 

 sured a foot diameter. Ten or fifteen 

 gallons of blood is thrown out of the 

 heart at a stroke, with an immense velo- 

 city, through a tube of a foot diameter. 

 The whole idea fills the mind with won- 

 der." It is thus, O great Author of all 

 Things ! we discover Thee in thy works* 



OF THE FIVE SENSES. 



Of Seeing-. The organ of seeing is 

 the Eye. It is a curious and most won- 

 derful piece of nature's work> admirably 

 rontrived with various coats^ muscles. 



