LEVERIAN MUSEUM. 



11 



(< and the different position of the particles, appears to have pro- 

 ie duced the natural Avanturine. 



Freyberg, 4th June, 1/90. De Charfentier." 



" I have seen with the greatest pleasure the large 

 " specimen of red-coloured quartz, mixed with mica, belonging 

 <f to Mr. Ludwig, which throws great light on the true origin of 

 tc the Avanturine. It is an unique piece, both on account of 

 <c its size and beauty. 



Cologne on the Rhine, 8th Jug. 1/90. Baron de Hutsch." 



" The under-signed attests never to have seen a 

 " quartz mixed with mica, of such size and beauty. It is usually 

 tc called Avanturine. Dr. Charles Henri Titius, 



Inspector of his S. H. the Elector of Saxony's 

 Dresden, Qth July, 1790. Cabinet of Natural History ." 



" As a zealous amateur of lithology, and possessor 

 te of a sufficiently compleat collection, I think it incumbent 

 <{ upon me to declare that I never have seen an Avanturine of a 

 f • beauty so perfect, and size so uncommon, as that belonging to 

 te Mr. Ludwig, of May ence. Joseph Frederick, 



Dresden, 12th July, 179O. Baron of Racknitx." 



Ci The under-signed acknowledges never to have 

 " seen so large and clear a quartz mixed with glimmer, which 

 cc so compleatly represents the composition known by the name 

 f( of Avanturine, Vosmaer, 

 Hague, 13 Sept. 179O. Director of the Cabinet of Nat. Hist. 



of the Prince Stadtholder, 



<e In addition to the foregoing testimonies of the 

 tf great judges in natural history, I must confess never to have 

 €f seen a production in the mineral kingdom which has so much. 

 <e excited my admiration, as this wonderful specimen, which I 

 <( had the pleasure of seeing through my acquaintance with its 

 cc proprietor, and which will be of great use, as adding to the 

 i{ discoveries in natural history. Francis William, 



Cologne, Aug. 5, 179O. Count ofOtting, Baldern,& Portern, 

 Testor et Olslupea* F. Wallr\b, Professor at Cologne." 



End of the Day's Sale* 



