REPORT OF THE SECRETARY. 9 



In continuation of the series of indexes to cliemical literature, pre- 

 pared under the direction and on the recommendation of a committee 

 of the American Association for the Advancement of Science, three 

 additional pamphlets have been issued, entitled Indexes to the Litera- 

 tures of Cerium and Lanthanum, by W. H. Magee, Ph. D.; Index to 

 the Literature of Didymium, by A. C. Langmuir, Ph. D.; and Bibli- 

 ography of Aceto Acetic Ester, by Paul H. Seymour, M. S. 



One of the treatises in the Miscellaneous Collections published during 

 the year, entitled The Varieties of the Human Species, by Giuseppe 

 Sergi, a translation of that author's work, Le Varieta Umane, Principi 

 e metodo di Classificazione, Torino, 1893, sets forth quite fully his 

 doctrines of craniology, elaborating a plan for a classification of human 

 species based on shapes of the crania. 



As a special publication of the Institution there was issued a Diary 

 of a Journey through Mongolia and Tibet in 1891 and 1892, by Mr. 

 William Woodville Rockhill. It is an octavo volume of 443 pages, 

 illustrated by 13 text figures and 28 plates, together with a large map 

 on a scale of 32 miles to the inch, showing the route traversed and the 

 topographic features of those little-known regions. The journey was 

 undertaken partly under the auspices of the Smithsonian Institution. 

 In addition to much valuable information gathered concerning the 

 characteristic features of those countries, Mr. Rockhill made some very 

 interesting ethnological collections for the National Museum, which are 

 described in detail in one of the accompanying papers of the Museum 

 Report for 1893. 



A revised edition of the Catalogue of Scientific and Technical Peri- 

 odicals (1665-1882), published by the Institution in 1885, is being pre- 

 pared under the direction of Dr. H. C. Bolton. In this new work the 

 periodicals in the former edition will be continued to 1895, and new publi- 

 cations will be added, making the catalogue as near as possible complete 

 to the time of printing. 



A supplement to the Bibliography of Chemistry, 1492-1892, published 

 in 1893, is being prepared by Dr. Bolton, with the assistance of several 

 collaborators in European libraries, and will bring the work down as 

 near as practicable to date. 



Annual Reports. — The Smithsonian Annual Report is the only public 

 document published by the Institution, and the greater portion of the 

 edition is distributed through the document rooms of the Senate and 

 House of Representatives. It is in two volumes — the first devoted to 

 the Institution proper and the second part relating to the National 

 Museum. The General Appendix of Part I consists of selected memoirs 

 of a special interest and permanent value which have, for the most part, 

 already appeared elsewhere, and which are sufficiently uutechnical to 

 be interesting to the general reader. 



The Annual Report of the Institution for 1893 and of the National 

 Museum for 1892 were received from the Public Printer and distributed 

 during the year, and the Museum report for 1893 was nearly completed. 



