37 Preliminary Note on the Compressibility of Glass 



made by blowing off steam is intensified by enlarging the 

 outlet. When the relief valve is opened very carefully it 

 whispers gently but very distinctly, till the pressure is all 

 down. If opened comparatively briskly, but still with great 

 care, the noise is comparatively loud, but more rapidly used 

 up. I forbear making any reflections until I have been able 

 to study this phenomenon more closely. 



Pieces of clear ice which had been subjected to high pressure 



in the receiver were finely 

 laminated in parallel planes. 

 In each plane there was a 

 central patch surrounded 

 near the sides of the block 

 by a ring of spherules. The 

 annexed figure gives an 

 idea of the arrangement. 

 The size of the spherules is 

 greatly exaggerated. 



The lamination of ice 

 by pressure in one direction 

 is well known. I am not aware that its production by 

 pressure in all directions has been noticed. 



