LETTER OF TRANSMITTAL. 



NEW YORK, JULY 24, 1894. 



The Committee of the American Association for the Advancement of 

 Science having charge of Indexing Chemical Literature has voted to recom- 

 mend to the Smithsonian Institution for publication the three following 

 Indexes : 



AN INDEX TO THE LITERATURE OF CERIUM. 

 AN INDEX TO THE LITERATURE OF LANTHANUM. 

 Both by W. H. Magee, Ph. D. 



AN INDEX TO THE LITERATURE OF DiDYMiuM. 1 



By A. C. Langmuir, Ph. D. 



The latter has already appeared in the School of Mines Quarterly, No. i, 

 Vol. XV. 



H. CARRINGTON BOLTON, 



Chairman. 



To the SECRETARY of the SMITHSONIAN INSTITUTION. 



1 This Index is printed as Smithsonian Publication No. 972. 



880863 



