74 Dr. Heberden's account of the heat of July, 1825 ; &c, 



so much the effect of wind exceeds that of mere moisture. 

 It is by walking, or riding, in such a state of the atmosphere, 

 that we produce on our bodies a current of moist air, which 

 is then felt in proportion to the rapidity with which we pass 

 through it. If it were thought worth while to bring this to 

 the test of the thermometer, the instrument should be made 

 to pass through the air at the same rate as the person would 

 move. 



