Annhfts of ihi Oriental Lapis Lazuli, 77" 



princes, lords, and knights of the kingdom ; and he efpoufed the daughter of a great lord, 

 in confideration of the important fervices he had performed ; and he was made gover- 

 nor of the ifland of Fayal." Thefe marks of diflinclion, conferred on a ftranger, could 

 not be meant as a recompenfe for the difcovery of the Azores, which was made twenty 

 years before, but as a reward for the difcovery of Congo, from whence the Chevalier 

 Behem had brought gold and different kinds of precious wares. This difcovery made much 

 greater impreffion than that of a weftern world, made at the fame time, but which neither 

 increafed the wealth of the royal treafury, nor fatislied the avarice of the merchants. 



In 1492 the Chevalier Behem, crowned with honours and riches, undertook a journey 

 to Nurenberg, to viGt his native country and his family. He there made a terreftrial 

 globe, which is looked on as a mafter-plece for that time, and which is (till preferved in 

 the library of that city. The outline of his difcoveries may there be feen, under the name o£ 

 wefl-ern lands ; and from their fituation it cannot be doubted that they are the prefent 

 Coafts of Bra2il, and the environs of the Straits of Magellan. This globe was made in 

 the fame year that Columbus fet out on his expedition ; therefore it is impoffible that 

 Behem could have profited by the works of this navigator, who befides went a much more 

 northerly courfe. 



[To 1'^ concluded in the next Numier.'] 



V. 



Analsjis of the Oriental Lapis Lazuli *. By M. KlafROTH. 



X HE analyfis of lapis lazuli made by Margraff has fhewn that the blue colour of this 

 ftone is not owing to copper, as has commonly been thought, but that it arifes from iron. 

 But as we have not hitherto poffefled any accurate analyfis of this ftone, I have thought it 

 might be ufeful to examine it anew. In faft, Margraff informs us, that lime, gypfum, and 

 filex, together with iron, are its component parts ; but he does not determine their propor- 

 tions ; and his analyfis is incomplete, as he does not mention the alumine which this ftone 

 alfo contains. 



According to Rinmann, the lapis lazuli contains lime, quartz, iron, and the acid of fluor. 

 I have not found the latter ; and it is probable that Rinmann's opinion was grounded upon 

 the phofphorefcence of this ftone when it is heated. 



Cronftedt and fome others have affirmed that the lapis contains a quantity of filver, after 

 the rate of two ounces per quintal. But my effays have afforded no certain indication of 

 the prefence of this metal. 



I feleded for experiment a fpecies of the lapis of a beautiful deep blue colour, and care- 

 fully feparated the white and pyritous fpecks. 



A. One hundred parts of lapis lazuli in thin flakes were kept in a ftate of ignition for 

 half an hour in a porcelain crucible. They loft two parts of their weight ; the colour was 

 not at all changed. This permanence at a great heat induced me to think that the ftone 

 might be of advantage in enamelling; to which opinion I was the more inclined, fronj 



♦ From the Annalei Ac Cliimie, XXI. 150, The French tranlljuon is made from the German, by Citizen 

 TalTaert, but whence taken Is not Tuid. 



Btrgmann 



