Treatises. 7 



it i> a work which it would pay every teacher of min- 

 eralogy carefully to study, even at the presenl day. 



Thus, we have traced the scientific development of 

 Haidinger from L811,when he entered the mineralogical 

 cabinel of Mohs at Grate, as apprentice, until L840, when 

 he was known to every mineralogist of Europe by his 



erly researches on special subjects, and by his ad- 

 mirable treatises* on mineralogy in general. Twenty- 

 nine years of earnesl study and labor in the field *>!' sci- 

 ence had achieved this degree of distinction — more than 

 enough to satisfy the ambition of the majority of working 

 scientists. But what was all this in the eyes of I Eaidinger 

 himself? He simply considered this successful life-work 

 as hi- preparatory studiesf which, by a high sense 

 of duty, he felt himself impelled to use t<» the advantage 

 of his fatherland when, by the death of Mohs (Septem- 



_ L839), Austria had lost the man to whom was 

 entrusted the great task ^t' properly arranging the best 

 mineralogical treasures collected at the capital in the 

 Hof kammer im Miinz-und Bergwesen. Haidinger was 

 appointed as successor to Mohs at this cabinet (April, 

 1840), and from that year until 1871, we have thirty-one 



- "f ardent and wonderfully successful labor of the 

 master, interrupted hut once by severe sickness, in 



Fully two years Haidinger was occupied in tin- arrange- 

 ment! of the great collection placed in his hands by the 

 above appointment In 1843 the catalogue was pul>- 

 lished. 



aeralogy, Edinburg, 1825; translated by Haidinger. 8vol- 

 Dgsgrunde, German edition, 1829. Bee above. The same. 

 . edition, in the Library of Useful Knowledge. 



f-Vorbereitangf rhandL GeoL Reichsanst 1864, p. 168. 



tThis arran;:<'m'-m met not <>iily the scientific requirements, but ;ii-" the practical 

 demands, of the mining engini - 1 ' the 



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