Of AUTHORS. 429 



6. Into facred, ecclefiaftic and profane. 



7. Into works that are preferved, and fuch as 

 are loft. 



8. Into authentic writings, andthofe that arc 

 fpurious. 



9. Into complete works, and fuch as are mu- 

 tilated, or fragments. 



10. Into books publifhed and unpublifhed. 



11. Into printed books and manufcripts. And 



12. Into authors that are called claflics, com- 

 mon books, and bibliotheques. 



III. With regard to the works themtelves, it 

 is neceflary (i.) to be well acquainted with their 

 titles, (2.) not to miftake allegorical for natu- 

 ral titles, (3.) when a book has two titles, not 

 to miftake it for two different works, (4.) not 

 to confound two authors that have the fame 

 name, as Pliny the naturalift, and the younger 

 Pliny, (5.) to know of how many parts or 

 volumes a work corfifts, (6.} clearly to under- 

 (land the titles that are marked by abbreviations, 

 (7.) to be acquainted with all the different 

 editions of a book, and to know which of them 

 is the' beft, (8.) to know the place, the year 

 and form of each edition, (9.) to know the fc- 

 vcr.il editors, (10.) to know if any paru 

 edition be enriched with notes or comn^ 

 with a fummary, index, preface &cc. (n.) ' 

 thefc are good, indifferent or bad, (12.) to 

 know who is the author of the notes, or i: 

 work have been publifhed cum nctis varicrum, 



