THE IMKK.NU, WORK 01 THE WTNT). 



without the ordinary use of wind, or Bail, or steam, ami without the expenditure of 

 any power except such as may be derived from the ordinary winds, make an 

 aerial voyage in any direction, whose length is only limited by the occurrence of a 

 calm. A ship is able to go against a head-wind by the force of thai wind, owing 

 to the fact that it is partly immersed in the water, which reacts on the keel, but it 

 is here asserted, that (contrary to usual opinion and in opposition to what at first 

 may seem the teachings of physical science) it is not impossible that a heavy and 

 nearly inert body, wholly immersed in the air, can lie made to do this. 



The observations on which the writer's belief in this mechanical possibility 

 are founded, will now be given. 



