xx TRANSLATOR S INTRODUCTION. 



He says, p. 4 ( )&amp;lt;): &quot;Tentamina idcirco quae 

 olim feceram, breviter expom-nda veniunt; ne 

 saltern alius &amp;lt;juis operam eandein perdat.&quot; He 

 anticipates J. Delboeuf s ** Prole*gomenes phil- 

 osophiques de la geometric et solution des 

 postulat-.&quot; with the full consciousness in 

 addition that it is not the solution, that the 

 final solution has crowned not his own intense 

 efforts, but the genius of his son. 



This son s Appendix which makes all pre 

 ceding space only a special case, only a species 

 under a genus, and so requiring a descriptive 

 adjective, I \uclldean, this wonderful produc 

 tion of pure genius, this strange Hungarian 

 flower, was saved for the world after more 

 than thirty-five years of oblivion, by the rare 

 erudition of Professor Richard Haltxer of 

 Dresden, afterward professor in the Univer- 

 &amp;gt;ity of Gie&amp;lt;sen. IK- it \va&amp;gt; who first did jus- 

 tire publicly to the works of Lobachevski 

 and Bolvai. 



Incited by Baltxer, in ISM, J. IIo el issued 

 a French translation of Lobachevski s Theory 

 of Parallel-, and in a note to his Preface says: 

 *M. Richard Haltxer. dans la seconde Edition 

 de see ezcellents I : foments de Geometric, a, le 

 premier, introduit CCS notions ex.ictes M la 

 place qu elles doivent occuper.&quot; Honor to 



