TRANSLATOR'S INTRODUCTION. xxi 



Baltzer! But alas! father and son were al- 

 ready in their graves! 



Fr. Schmidt in the article cited (1868) says: 

 ' ' It was nearly forty years before these pro- 

 found views were rescued from oblivion, and 

 Dr. R. Baltzer, of Dresden, has acquired im- 

 perishable titles to the gratitude of all friends 

 of science as the first to draw attention to the 

 works of Bolyai, in the second edition of his 

 excellent Elemente der Mathematik (1866-67). 

 Following the steps of Baltzer, Professor 

 Hoiiel, of Bordeaux, in a brochure entitled, 

 Essai critique sur les principes fondamentaux 

 de la Geometric elementaire, has given ex- 

 tracts from Bolyai's book, which will help in 

 securing for these new ideas the justice they 

 merit." 



The father refers to the son's Appendix 

 again in a subsequent book, Urtan elemei kez- 

 doknek [Elements of the science of space for 

 beginners] (1850-51), pp. 48. In the College 

 are- preserved three sets of figures for this 

 book, two by the author and one by his grand- 

 son, a son of Janos. 



The last work of Bolyai Farkas, the only 

 one composed in German, is entitled, 



Kurzer Grundriss eines Versuchs 



I. Die Arithmetik, durch zvekmassig kons- 



