Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXIX. No. 2:5. —June, 190i. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY 

 OF HARVARD COLLEGE. 



THE SIGNIFICANCE OF CHANGING ATOMIC VOLUME. 



lY.— THE EFFECTS OF CHEMICAL AND COHESIVE 

 INTERNAL PRESSURE. 



By Theodore William Richards, 



