494 



M ineralogia. 



Erasmus Bartholin, 



An accompt of fun dry experiments upon a chryftal- like 

 body, fent to him out of Island (cryftallus Islandica). 

 Philof. Transact. Y. 1670. p. 2039. 

 John Begcaria, 



Account of the double refractions in cryftals. 

 Ibid. Y. 1762. p. 486. 

 Johann Efaias Silberscrxag, 



Von dem die Bilder ' verdoppelnden to genanhten Islandi- 

 " Tchen ; "CryftaI! oder Boppelfpath. 

 Schr.derBerl.Gef.Naturf.Fr. B.8- (Beob. B. 2.) St. 2. S.i. 

 Rene Jufi Hauy, 



Memoire fur la double refraction du fpath d'Islande. 



Mem. de 1'Acad. des Sc. de Paris. A. 1788» Mem. p. 34. 

 Note fur la double refraction du foufre. 

 Soc. Philomath. A. 6, p. 127. 



Electricitas Mineralium 



Francois Ulric Theodore Aepinus, 



Memoires concernant quelques nouvelles experiences 

 electriques remarcruables. 

 Memoires de Berlin. A. 1756. p. 105. 

 Ernft Chriftoph Schulz, 



Ueber die Electricitat verfchiedencr Schorle. 



Mayers Samml. Phylikal. Aufiatze der Gefellfch. Boh- 

 mifcher Naturforfcher. B. 1. S. 261. 

 Benjamin Wilson, 



Experiments on the tourmalin. 



Philof. Transact. Y. 1759. p- 3<>g. 

 Letter on electricity and the tourmalin. 



Ibid. Y. 1763. p. 463. 

 Obfervations upon fome gems limilar to the tourmalin in 

 regard to electric experiment?. 

 Ibid. Y. 1762. p*443. 

 Torbern Bergman, 



Afhandling om tourmalin ens electriska egenskapen 

 Vetensfe. Acad. Handlingar. A. 1766. S. 57. 



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