vi PREFACE. 



of the Catalogue, cannot be exhaustive, but it contains nearly all the 

 standard works, and most of the earlier works of historical importance, 

 and will be found of great use as a Reference-list apart from the 

 Catalogue; and, to increase its value in this way, references hare been 

 included to two large scientific catalogues issued after the Bibliotheca 

 Chem ico-Mathematica was printed. 



The ILLUSTRATIONS hare all been produced from the actual 

 books by a photographic process, and include, besides facsimiles of 

 illustrations and portraits, textual passages from historically im- 

 portant works. Many such are here reproduced for the first time. 



There remains to the writer of these lines the pleasure of saying 

 that the whole work is due to IlEINlUCH ZEITLINGER, of Linz on 

 the Danube, whom he has known for so many years as an equal 

 irellwisher of learning and of England. His own share Jias been the 

 lesser one of revision and proof -reading, and of further annotation 

 from that Cyclopaedia of Useless Knowledge to which we all become 

 subscribers in our journey through the world. 



Lastly, to hare avoided all mistakes no man can hope ; but both 

 compilers can honestly say that from beginning to end they have never 

 forgotten the great precept of Dr. Martin Joseph Routh. 



H. C. S. 



Allhallowtide, J920. 



