vi PREFACE, 



of the Catalogue, cannot he exhaustive, hut it contains nearly all the 

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

 and will he found of great use as a Heference-list apart from the 

 Catalogue ; and, to increase its value in this tvay, references have heen 

 included to two large scientific catalogues issued after the Bihliotheca 

 Chemico-Mathematica was printed. 



The Illustrations have all heen produced from the actual 

 hooks hy a photographic process, and include, hesides facsimiles of 

 illustrations and portraits, textual passages from historically im- 

 portant tvorks. 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 Heinbich Zeitlinger, of Linz on 

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

 wellivisher of learning and of England. His own share has been the 

 lesser one of 7'evision and fr oof -reading, and of further annotation 

 from that Cyclopaedia of Useless Knowledge to tvhich we all hecome 

 suhscrihers in our journey through the ivorld. 



Lastly, to have avoided all mistakes no man can hope; hut hoth 

 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, 1920. 



