Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXVL No. 2U. — March, 1901. 



CONTRIBUTIONS FROM THE CHEMICAL LABORATORY 

 OF HARVARD COLLEGE. 



A STUDY OF GROWING CRYSTALS BT INSTANTANEOUS 



PHO TOMICR GRAPH Y. 



By Theodore William Richards and Ebenezer Henry Archibald. 



With Three Plates. 



Investigations ox Light and Heat, made and published wholly or in part with Approprlations 



from the rumford fond. 



