Publications of the United States 

 National Museum 



The scholarly pul>lications of the United States National Museum include two 

 series, Proceedings oj the United Slates National Museum and United States National Museum 

 Bulletin. 



In these series are published original articles and monographs dealing with the 

 collections and work of the Museum and setting forth newly acquired facts in the 

 fields of Anthropology, Biology, Geology, History, and Technology. Copies of each 

 publication are distributed to libraries and scientific organizations and to specialists 

 and others interested in the different subjects. 



The Proceedings, begun in 1878, are intended for the publication, in separate 

 form, of shorter papers. These are gathered in volumes, octavo in size, with the 

 publication date of each paper recorded in the table of contents of the volume. 



In the Bulletin series, the first of which was issued in 1875, appear longer, sepa- 

 rate publications consisting of monographs (occasionally in several parts) and volumes 

 in which are collected works on related sulajects. Bulletins are either octavo or quarto 

 in size, depending on the needs of the presentation. Since 1902 papers relating to 

 the botanical collections of the Museum have been published in the Bulletin series 

 under the heading Contributions Jrom the United States National Herbarium. 



The present collection of Contributions from the Museum of History and Tech- 

 nology, Papers 19-30, comprises Bulletin 228. 



Frank A. T.-wlor 

 Director, United States National Aluseum 



IV 



