226 PHILOSOPHICAL TRANSACTIONS. [aNNO 1728. 



passed over, as less relating to the affair of metals; only adding that these crys- 

 talline concretions exert a strong attraction on many metallic substances. 



The sulphureo-saline particles, with which the waters are frequently saturated, 

 are found to be either of a vitriolic or an arsenical nature; the first constantly, 

 if pure, concreting into white cubes resembling grains of silver, while the arse- 

 nical sulphur concretes into yellow cubes like grains of pure gold. Both these 

 are by the miners termed mundick. 



These sulphureo-saline substances seem directed in their concretions by a 

 plastic particle, in the same manner as the crystals, and, like them, on the 

 same principles, are found simple or compound. In their sides the concretion 

 forms itself like threads, which in three sides run in different directions, but 

 are always similar in the opposite sides. 



The mines are found to contain tin, lead, copper, iron, and a pseudometallic 

 substance, by the miners termed glist; of all which more hereafter. 



Astronomical Observations made at Lisbon, in the Year 1726. Bi/ Fa. Carhone. 

 N°401, p. 408. 



These observations are of the eclipses of Jupiter's first satellite, which are 

 not now of any manner of use, since the theory of those satellites has since 

 been brought to much greater degrees of accuracy in the more modern tables. 



Observations made in the Dissection of three Subjects. By Mr. Ranbij, F. R. S. 

 N°401, p. 413. 



The first, a man aged 70 years, who died of a suppression of urine, occa- 

 sioned by a stone stopping in the urethra, just within the glans, of the size of 

 a horse-bean. This appearance, with the symptoms that had attended this 

 miserable man, gave reason to expect something remarkable in the urinary pas- 

 sages. The ureters and pelvis were very much distended, which is common 

 where great numbers of stones have descended down them, from the kidneys 

 to the bladder. The bladder contained about 60 stones, the largest of which 

 was about the size of a walnut, the others smaller; and just witiiin the neck, 

 was a hard tumour, as large as a nutmeg, which almost closed the orifice; and 

 indeed the situation of this tumour was such, that it not only made the passing 

 of the catheter very difficult, and prevented feeling the stones, by directing the 

 instrument upwards; but likewise would alone produce the symptoms of the 

 stone in the bladder, by obstructing the free discharge of urine through the 

 urethra. Its inner membrane appeared as if lacerated in several places, and the 



