PHYSICAL PARADOXES. 



The bullet will now be found at the end D 

 of the ice chamber, having apparently travelled 

 through the ice. 



Replacing the whole for a time in the freez- 

 ing mixture, to keep it cool, repeat these opera- 

 tions with E once more at the top, forcing in 

 E, and then removing B. F will be found to have 

 travelled back to C, apparently through the ice. 



The fact is that each time the ice is violently 

 compressed, it is forced back into the state of 

 liquid, the bullet falls through the water, and 

 when the pressure is relaxed, the water is re- 

 converted into ice. 



That this is the case can be proved by listen- 

 ing carefully while the ice is under violent 

 compression and the cylinder is turned end over 

 end. The bullet can be heard and felt striking 

 the bottom of the small chamber as it falls 

 down each time the cylinder is turned over. 

 While the pressure is on, there is, in fact, no 

 ice ; it is compressed into water. 



Ice, therefore, can be squeezed into water 

 by the simple process of compression. This 

 seems natural enough when we remember that 

 water, in freezing, expands so as to occupy 

 more space. If, then, we forcibly prevent 

 water from occupying more space, it cannot 

 freeze. Or if, after it has frozen, we force it 

 back into smaller space, it must go back out of 

 the state of ice, which requires more room, into 

 that of water, which requires less. 



122 



