NOTES 2 I 5 



Separate publications and books are treated in like manner in 

 regard to classification, although the methods of obtaining notice 

 of their appearance is necessarily dififerent. 



To classify properly into minute subdivisions, such as are em- 

 ployed in this work, the vast amount of scientific matter appearing 

 in this country is a difficult task, but every efifort is used to make the 

 references exact, and where an intricate question is involved the 

 advice of a specialist is asked. At the central bureau a corps 

 of referees are employed, a specialist for each science, who, to guard 

 against error, review each reference before publication. 



This catalogue now furnishes aid to both librarians and students 

 who have long needed a concise subject index to the great and ever- 

 increasing scientific literature of the day. 



The United States leads in the number of subscribers to the cata- 

 logue, the number being 97, equivalent to over ^2 complete sets. 

 The yearly subscription to the full set of seventeen volumes is $85. 

 The individual volumes ma.y be subscribed to for a sum pro rata 

 to the cost of the full set. 



Smithsonian Seat at Naples 



Dr. Charles Sedgwick Minot, Professor of Histology and 

 Embryology in Harvard University, occupied the Smithsonian Table 

 at the Naples Zoological Station in the autumn of 1902, devoting 

 his time to procuring extensive series of embryos of Torpedo ocel- 

 lata, Mustelus l<2vis, Petromyson, and Amphioxus, and young stages 

 of Pristiurus and Scylliiim. Owing to the exceptional opportuni- 

 ties for procuring collections at the Station, Doctor Minot reports 

 that he was able to obtain fine series of carefully 'selected stages of 

 specimens, which, arranged in serial sections, have been added to 

 the embryological collections at Harvard University, where they will 

 be accessible to all competent investigators, and will serve for many 

 years for researches in comparative embryology. 



Dr. Charles W. Hargitt, of Syracuse University, was granted 

 the occupancy of the Smithsonian Table at the Naples Zoological 

 Station for the months of March, April, and May, 1903, during 

 which period it was possible for him to finish a research on the early 

 development of Eudcndrinm, a genus of hydroids of whose develop- 

 ment comparatively little has hitherto been known. The manuscript 

 of the full report is now in the hands of the editor of the Zoolog- 

 isches Jahrhuch for publication, and will probably appear during 

 the current year. Doctor Hargitt found that while, in the main, 

 the course of development in these hydroids is comparable with that 



