PREFACE. 



This work is intended to be a list of all the books and smaller treatises, 

 especially contributions to scientific periodicals, on the spectroscope and 

 spectrum analysis from the beginning of our knowledge upon the subject 

 until July, 1887 ; an Index or Bibliography of the Spectroscope aud Spec- 

 trum Analysis. 



It was begun at the suggestion of Dr. Wolcott Gibbs, whose work in 

 connection with the subject is well known. 



The object is to enable a chemist to find out at a glance all that has 

 been published in any branch of his subject where the spectroscope is 

 used, and what every writer has published. 



The method pursued has been as follows: 1, to examine the bibliog- 

 raphies, booksellers' catalogues, and books on spectrum analysis for 

 books ; 2, to examine the scientific periodicals for the shorter treatises, 

 the first and original contributions to the subject, and this was done 

 volume by volume wherever there was no index to a series of years — as 

 in the Comptes Rendus and the later volumes of the Annales de Chemie 

 et de Physique and of (Poggendorff's, now Wiedemann's) Annalen der 

 Physik und Chemie, as well as others. Use was made of the bibliog- 

 raphy at the end of Roscoe's Spectrum Analysis, and in the reports of 

 the British Association for 1881 and 1884, for such books and articles as 

 the author could not find elsewhere. Credit is also due to the Astor 

 Library and its managers for the means it afforded the author of making 

 this Index. 



After the greater part of the material was collected it was divided into 

 such subjects as the titles indicated, in alphabetical order, easy finding 

 being constantly kept in view. Titles have often been repeated more 

 than once so as to make sure of their being found. Finally, at the sug- 

 gestion of the Smithsonian Institution, the List of Authors was added. 



The author hopes that his two objects, fullness and ready access of all 

 the titles, will prove to have been gained. 



New York, 1887. 



(v) 



