Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXVII. No. 15. — February, 1902. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY 

 OF HARVARD COLLEGE. 



THE SIGNIFICANCE OF CHANGING ATOMIC VOLUME. 



II. — THE PROBABLE SOURCE OF THE HEAT OF CHEMICAL 

 COMBINATION, AND A NEW ATOMIC HYPOTHESIS. 



By Theodore William Richards. 



Investigations on Light and Heat made and published whollt or in part with Appropriations 



prom the rcmford fund. 



