PREFACE. 



In this volume I have continued my Index to the Literature of 

 the Spectroscope, Smithsonian Miscellaneous Collections No. 658 

 (published in 1888), to the end of the year 1900, after which date 

 the International Committee for Indexing Scientific Literature begins 

 the continuation of the work of cataloguing Spectroscopy. I have 

 been obliged to leave Astronomical Spectroscopy incomplete, for want 

 of space. In other respects I hope this second volume will be con- 

 sidered an improvement on the first. 



Alfred Tuckerman. 



New York, Feb. 3, 1902 



