238 



in the minds of your committee whether some of these are not incorrectly 

 listed. 



It was intended that all volumes should be listed by the volume nurrber 

 when that could be determined and the date of issue given only when the 

 volume number was not known. There has been great lack of uniformity in 

 following this rule, which introduces considerable confusion into the lists. 

 Your committee has no means at hand by which to correlate dates and 

 volumes. Where it has seemed possible we have ventured to substitute 

 volume numbers for dates, but in most cases we have foimd it necessary to 

 leave the lists unchanged in this particular. 



It may be found that some titles are included in the catalogue that have 

 doubtful claim to being recognized as pertaining to serials that are either 

 scientific or technical. As the conmiittee could not be personally acquainted 

 with every serial named we have trusted largely to the judgment of the li- 

 brarians. A few titles, such as the Lilcrnrij Di'jent, we have ventured to ex- 

 clude. The inclusion of such doubtful material, however, docs not seem to 

 us a serious fault, on the jjrinciple cpioted by Bolton from Zuchold that in 

 a bibliography it is much better that a book should be found which is not 

 sought, than that one should be sought for and not found." 



In the prosecution of this work the committee has consulted various 

 catalogues and freely adopted suggestion from many of them. The following 

 may be especially mentioned: 



A catalogue of scientific and technical periodicals 1665-1895. Smith- 

 sonian miscellaneous collections 40. 



List of serials in the Universitj' of Illinois library together with those 

 in other libraries in Urbana and Champaign. Univensity of Illinois 

 Bulletin 9=. 



List of serials in the principal libraries of Philadelphia and its vicinity. 

 Bulletin of the Free Library of Philadelphia. No. 8. 



List of periodicals, newspapers, transactions and other serial publica- 

 tions currently received in the principal libraries of Boston and 

 vicinity. 



List of biological serials in the libraries of Baltimore 1901. 



List of serials in L'niversity of Colorado library. University of Colorado 

 bulletin. 13'. 



