158 



FERGUSON'S LECTURES. 



LECT 



V 



4. Hot steam is very elastic ; and when it is cooled 

 by any means, particularly by its being mixed with cold 

 water, its elasticity is destroyed immediately, and it is 

 reduced to water again. 



5. If a vessel be filled with hot steam, and then closed, 

 so as to keep out the external air, and all other fluids ; 



