48 .VBSTRACTS: CHEMICAL TECHNOLOGY 



completed and sent to press while the writer was Chief of the Bureau." 

 The purposes of the present volume and the natiire of its contents 

 are also best given in his own words. "This work." he says, "is not 

 designed as a formal presentation of American archeology- in which the 

 antiquities are described and discussed countr\- by countr\-. or region 

 by region, in geographical sequence, but rather as a reference work or 

 manual, the principal purpose of which is to assemble and present the 

 antiquities of the continent in such a manner and order as to make 

 them readily available to the student who shall undertake to present 

 a comprehensive \-iew of the evolution of culture among men. 



■'The present voltmie is, in large measure, introductory- to the sj's- 

 tematic presentation of the antiquities ; it deals with the scope of archeo- 

 logic science, the character, extent, and classification of its subject 

 matter, the progress of research; with the several important problems 

 which present themselves for solution, including those of race origin, 

 migrations, cultiu-e evolution, and chronology; with the ethnic charac- 

 terization areas; with the acquirement of the substances employed in 

 the arts ; and finally with the manipulation of stone. 



"The second volume is to be devoted exclusively to the implements, 

 utensils, and other minor artifacts of stone. These are given prece- 

 dence over other grand di\-isions of the subject matter for the reason 

 that they lie at the foimdation of Stone Age culture, and. for that 

 matter, at the foimdation of all progress toward the civilized state, 

 and at the same time are the chief rehance of the historian and chronol- 

 ogist who seeks to write the early chapters of the stcny- of humanity. 

 Additional voliunes are expected to treat of all the remaining materials 

 — min eral, animal, and vegetable — -and it is further planned to give 

 separate consideration to the more important arts and industries prac- 

 ticed by the native peoples, as building, sculpture, the textile and 

 fictile arts, and metalliu-g>-." J. R. Sw.\nton. 



CHEMICAL TECHNOLOGY.— Constani-tetnperatttre still head for 

 light-oil fractionation. Frederick M. Washburn. Bur. Stand- 

 ards Techn. Paper 140. Pp. 12, figs. 4. 1919. 

 The three t\-pes of methods generally in use for the fractionation of 

 light oil for the determination of benzene, toluene, and solvent naphtha 

 are discussed. An apparatus which is an improvement on the de- 

 phlegmator of the Wilson and Roberts still is described, and the details 

 of its operation are given. The apparatus is easily and inexpensively 

 constructed, and requires no greater attention or time than others used. 



