VOL. XLV 



•:i 



PHILOSOPHICAL TRANSACTIONS. 



546 



Richard Davies m.d. I have lastly to this collection of experiments added 

 some of my own, which I endeavoured to make with as much accuracy as the 

 instruments I was provided with would allow of. My hydrostatical balance was 

 one constructed several years since by Mr. Francis Hauksbee, which I have con- 

 stantly found to turn sensibly with half a grain : and the bodies on which I made 

 most of my trials, were taken from a collection of the materia medica formerly 

 made by Signor Vigani, and still preserved in the library of Queen's College in 

 Cambridge. 



TABLE I.— Of Metals. 



O Gold, fine. Ward, C 19.640 



A medal esteemed near fine gold. J. C. 19.636 



Or d'essai, on de Coupeile. Muscb. 19.238 



Fine gold hammered. Ellicol 19.207 



D° an ingot, and refined with Anti- 

 mony. EUicot 19- 1 84 



D" that ingot itself. Ellicot 19.I61 



A medal of the 11. s. esteemed fine 



( gold. Graham 19.158 



; A gold medal of Queen Eliz. J. C. . . 19.125 



D° of Queen Mary, J. C 19.1<X) 



Aurum. Fahrenheit 19.O8I 



Id Ghetaldus. Aurum purum. Bacou 



(ex hyp.) 19.000 



A gold coin of Alexander's. J. C. . . 18.893 



Gold. Reynolds I8.8O6 



Aurum. 'Villalpandus. Petit 1 8.750 



Standard gold (by which is understood gold of 22 



carats, or such of which our guineas are in- 

 tended to be coined). J. C. "Ward. C. 18.888 



An old Jacobus. Probably the scej)- 



tered broad piece. Harris 18.375 



A Mentz gold ducat. J. C 18.261 



Aureus Ludovicus. Muschenbr 18.1 66 



A 5-guinea piece of K. James II. l687, 



with an elephant. Graham 17-933 



A Portugal piece of 31. I'^s. 1731, 

 supposed to be nearly the same as 

 standard. Graham 17.854 



Guineas, 10 weighed together. Davies 17.800 



D° on a mean of 7 trials on those of 



different reigns. Ellicot 17.726 



A piece of gold coin of the common- 

 wealth. Harris 17.625 



17.414 



12.28() 

 12.071 



Guineas, 1 new ones. Hauksbee 

 A grain of Scotch gold, such as nature 



had mad.' it. Boyle V. 30, b. . Vi^ 

 Electrum, a British Coin. J. C. . . . 

 D Quicksilver. Mercurius crudus. 



Freind 14.117 



Mercury Spanish. Boyle V. 10, b. 



Mercury sublimed 1 1 times. Musch. 14.110 



Quicksilver Oxford Soc 14.019 



D° Ward. C. revived from the ore. 



Boyle 14.000 



VOL. IX. 4. 



Fine mercury. L 13.943 



Quicksilver, another parcel. Oxf. Soc. 13.593 

 Mercury amalgamated with silver, re- 

 fined and sublimed 100 times. 



Muschenb 13.580 



Mercurius. Fahrenheit * 13.575 



Argentum vivum. Ghetaldus. 13-f .. 13.571 

 Mercure amalgami avec de I'or, affine 

 et sublime 100 fois ; le meme in le 

 avec du plomb, ensuite converti en 



poudre et revivifie. Musch 13.550 



Coarse mercury. L 13.512 



Mercurius. Petit 13.406 



Quicksilver. Reynolds 13.147 



K Lead. Reynolds 11 .856 



Plumbum. Villalpand 11.650 



Id. Ghetaldus 114. 11 500 



Id. Bacon 11 .459 



Lead. Harris 11 .420 



Hardest lead. L 11.356 



Plumbum. Fahrenheit 11 .350 



Lead. Oxford Soc. Ward 11.345 



Plumbum. Petit 11 .343 



Lead. Harris (an ordinary piece). . 11.330 



D" Cotes 1 1-325 



Plumbum Germanicum. Musch. .. 11.310 



Cast lead. L II.260 



([ SiLv Ell, fine. Ward. C II.O91 



A medal of tlie a.s. reported fine sil- 

 ver. Graliam 10.484 



Argentum. Fahrenheit 10.481 



Silver. Reynolds 10.432 



Argentum. Villalpandus 10.400 



Id. Ghetaldus. 10.J 10.333 



Id. Bacon 10.331 



Id. Petit 10.219 



Sterling or standard silver (that is, sil- 

 ver 1 1 oz. 2 dwt. in the pound fine) 

 A half-crown of K. William's coin. 



Harris 10 750 



D" struck into money. L 10.629 



D°J. C.Ward. C 10.535 



D° Cast. L • . 10.520 



A new crown-piece, 1746. Lima 



under the head, Graham « 0.284 



