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devoted to Mathematical and Physical Science. 347 Ps 
materials needed for its completion. English, French, German, 
Dutch, Spanish, Italian, Hungarian, Russian, Swedigh and Latin 
1 i sacked before t 
delicate exercise of judgment in accepting, and réjecting titles 
will be required. There will be sundry questions such as these— 
Shall any anonymous papers be included? Shall rs in the, 
library magazines be selected? Shall titles be given in full and 
literally, or cut down, modernized, translated or anotated? Shall 
translations be included ? all reprints into more accessible se- 
ries be referred to? &c. It has been my practice to include the 
date in each title, and to give the limiting pages of each memoir 
as an indication of the fullness with which its subject is treated. 
The labor of classification will be one demanding a truly cos- 
advantages. But whatever system is adopted, an alphabetical 
need not further enlarge on this plan. Should there be any 
who has capacity and courage to undertake the great enterprise 
indicated, farther hints would be superfluous for him. Should 
there be several who are willing to associate their labors, each 
taking certain series, and so together exploring the whole, it will 
not be difficult to concert such a general plan. The greatest 
difficulty of such an association would be in securing thorough 
codperation and uniform execution. The means of classi tion 
would of course be by movable slips, and thus most incongrui- 
ties of plan would be avoided by making the classification the 
work of one. 
When we look at an individual labor so valuable as Poole’s 
Index of Periodical Literature, we cannot doubt that the labor 
now proposed is destined ere long to enlist far greater industry 
and talent, and that if seriously undertaken it must succeed. 
