VOL. XXII. 3 PHILOSOPHICAL TRANSACTIONS. 525 



Concerning a Stone cut from a Child, having a Flint within it. By Dr. Geo. 



Garden. N° 26Q, p. 689. 



A young boy, of 5 or 6 years of age, was lately cut here for the stone ; 

 and when the stone was taken out of the bladder, being by accident broken a 

 little, there was to be seen within it a flint stone, shaped like to that of a pistol, 

 with a calculus crusted about it. That the flint has not been formed in the 

 bladder, but that this might have been occasioned by the boy's swallowing the 

 flint stone, seems probable, from another strange instance of a man in the same 

 country, who voided with his urine a small pistol bullet, crusted over with 

 calculous matter, after the same manner. 



ji Letter from Dr. JFm. Musgrave, F. of the Lond. Coll. of Phys. and of the 

 Royal Society, concerning a Polypus found in a Dog. Translated from the 

 Latin. N° 266, p. 69O. 



In dissecting a dog we found near the spleen a globular substance, resembling 

 at first sight a gland. It was 3 inches in diameter, with a tunic like that of the 

 veins. This tunic was supplied with a branch proceeding from the splenic vein. 

 On cutting into it, it exhibited an imperfect fleshy substance, intermixed with 

 clots of blood. There was a passage for the blood through the middle. This 

 was certainly a polypus of a very extraordinary sise. 



On the Cataract in Gottenburg River, and the Remains of the Observatory of 

 Tycho Brake. By the Rev. Mr. Gordon, F. R. S. N° 26Q, p. 691. 



Gottenburg river, at some leagues distance from that town, comes to a 

 prodigious high precipice, and rushes down it with a terrible noise, and such a 

 mighty force, that the masts and floats of timber to Gottenburg, rushing 

 down from the precipice into a deep pit, many of the masts, which usually turn 

 topsy-turvy in their fall, fly to pieces when dashed against the surface of the 

 water in the pit. This happens when the masts fall side-wise on the water; 

 but if they fall end-wise, they dive so far under water, that they rise not again 

 for 4- hour ; others 4- hour, several |- hour ; and some a whole hour and up- 

 wards. The lake or pit into which they fall, has been often sounded with a 

 line of some hundred fathoms long, but they could never find any bottom. 



As to the island Ween, commonly called the Scarlet Island, famous for 

 Tycho Brahe's Astronomical Observations, I had an opportunity of viewing the 

 ruins of the noted Observatory erected by that astronomer. The island, I 

 think, was not so proper for some astronomical observations, such as taking the 



