Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXVI. No. 20. — 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 on Light and Heat, made and published wholly or m part with Appropriations 



FROM THE RUMFORD FOND. 



