CATALOGUE. — SPONTANEOUS ELECTRICITY. 



435 



One from a projecting point which gives sparks at diffcr- 

 ont distances, according to the kind of «i«etricity : the 

 •ther from the decomposition of water. 



Cuthbertson on the distinction of electricities. 

 Nich. 8. III. 188. Ph. M. XIX. 83. 



From the heat of a candle communicated to the negative 

 bail. 



Spontaneous Electricity. 

 Of Inanimate Substances. 



Atmospheric Electricity. 

 See Meteorology. 



Mineral Eltctriciltf. Tourmalin and other 



Crystals. 



Due de la Noya Caraffa surla tourmaline. 4. 

 Par. 1759. M. B. 



Wilson. Ph. tr. 1759. 302. 1763. 436. On 

 some similar gems. Ph. tr. 1762. 443. 



fWatson on the lyncurium. Ph. tr. 1 759. 394. 



Aepimis Recueil de memoires sur la tourma- 

 line. 8. Petersb. 1762. 



Aepinus on the Brasilian emerald. N. C. 

 Petr. XII. 351. 



Bergmann. Ph. tr. 1766. 236. Schvv. Abh. 

 XXIII. 286. 

 Finds, that one pole of the tourmalin becomes positive 



by expansion, and negative by contraction, the other the 



reverse. 



Bergmann on the electricity of Iceland crys- 

 tal. Opusc. V. 36G. On the tourmalin. 401. 



Wilke. Schw. AbH. XXVIII. 95. XXX. 1, 

 105. 



Franklin. A. P. 1773. H.78. 



Miiller an Born. 4. Vienna, 1773. 



Zallinger vom turmalin. 8. Vienna, 1779. 



Gerhard. Roz. XXI. Suppl. 1782. 



Ddaunay Lettre sur la tourmaline. 4. R, S. 



Werner in Cronstedt's mineralogy. 



Hauy. A. P. 1785. 206. 

 On the tourmaline and on electricity as a test. 



Haliy on the boracite. Ann. Ch. IX. 59. Roz 

 XXXVIII. 323. Gren. VII. 87. 



Haliy on the electricity of some crystals. M. 

 Inst. I. 49. 



Haiiy Traite de physique. I. 



Haiiy has observed, that electrical crj'stals are notsj'mme- 

 trically formed at the corresponding angles : thus in the bo- 

 rate of magnesia the 4 intire angles became negative, and 

 the 4 truncated angles positive. 



Beckmann. Erfind. 2 ed. I. 248. 

 Napione sul lincurio. 4. Rom. 1795. R. S. 

 Ritter on electrical polarity. Giib. XV. 106. 

 On terrestrial electricity. Gilb. XVll. 482. 



Animal Electricity. 



See Chemical Electricit}'. 



On electric fishes. Roz. Intr. II. 432. 



Oseretskovsky on a preternatural electricity.. 



A. Petr. III. i. 2.33. 



The person was Michael Puschfcin of Tobolsk ; the rela- 

 tor was not an eye witness. 



Lovens on electricity as a living force. 1779. 

 Geoffrey on the anatomy of electric fishes. 



B. Soc. Phil.n. 70. Journ. Phys. LVI.242. 

 Ph. M. XV. 126. Gilb. XIV. 397. 



Haiiy on electric animals. Traite de'Phys. 4 1 . 



Raia Torpedo. 



Authors on the torpedo. Krlinitz. Abhandl. 



xvii. 

 Reaumur. A. P. 1714. 344. H. 19. 

 TewpZeOTflM in Nouvelliste. 1759. 

 Schilling de morbo yaws. Utr. 1770. 

 Walsh. Ph.tr. 1773. 461. 1775.46.5. 

 Hunter. Ph. tr. 1773. 481. 

 Pringle's discourse on the torpedo. 4. Lond. 



1775. 

 't-Ingenhousz. Ph. tr. 1775. 1. 

 *Gavendish. Ph. tr. 1776. 196. 



The shock of the torpedo resembles that of a lar^-e 

 battery weakly charged; such a shock will pass but a little 

 way through the air. An artificial torpedo was made so as 



