( 119) 



a Book-Catalcgue shall be issued; secondli/, that moreover a primary 

 Slip- Catalogue shall be edited, with this restriction however that 

 but one slip has to be issued for each publication (book, paper etc.); 

 thirdly, that a secondary Slip-Catalogue shall be composed in which 

 each paper has to be represented by one slip lor every subject treated 

 therein, so far as these subjects give rise to different entries in 

 the Book-Catalogue; every effort being made however to prevent 

 an excessive extension of the number of slips pertaining to one 

 paper. 



As a result of the committee's estimates and calculations it ap- 

 peared that on the f,rst supposition the receipts probably will cover 

 the expenses, if not at once at least after a certain period ; that 

 this may be the case even on the second supposition; but that it 

 can hardly be expected on the third supposition. 



In the third place the report of tlie Royal Society-Committee 

 contained classification-schedules, worked out for most of the sciences 

 that have to be treated in the Catalogue. 



In these schedules, the construction of which differs considerably 

 for the different sciences, according to the particular demands of 

 each science, ample room has been left everywhere for changes and 

 extensions, that may be desirable in future. The registration-symbols 

 and numbers only play a subordinate part. They are technically 

 indispensable to the work of the Central Bureau and for arranging 

 the slips of the Slip-Catalogue. Acquaintance therewith however 

 may be considered as wholly or to a great extent superfluous to him 

 who uses the Catalogue. 



When too many entries should come under the same heading, a 

 further sub-division may be attained by the introduction of „signi- 

 ficant words" which may afterwards, if desirable, be transformed 

 into new headings. In this way a natural growth of the classifi- 

 cation will be arrived at, keeping up with the development of science. 



Taking into account this in my opinion very suitable construction 

 of the book-catalogue and the circumstance, that the instituting of 

 Committees of Referees seems to me a sufficient guarantee that the 

 needs and demands of the real scientific workers in the different 

 sciences will be decisive, I complied with the above-mentioned 

 rcijuest of the Royal Society-Committee by stating that my personal 

 opinion was in favour of the project in general. At the same time 

 I subjected the mathematical schedule to a closer examination and 

 added some remarks on the classification-schedules of more general 

 tendency. 



9* 



