VOL. XLI.J PHILOSOPHICAL TRANSACTIONS. 463 



the parenchyma of the kidneys, which cells were all ulcerated within, and full 

 of matter, communicating with the pelvis; the whole substance of the kidneys 

 was scirrhous. The patient had long been troubled with grievous pains of 

 the back, and had voided great quantities of pus with all the urine she made, 

 so that there was no doubt of there being ulcers in her kidneys; and she her- 

 self often declared there were stones in the kidneys, which, on any motion, 

 she could feel grate against each other. 



The left kidney was likewise full of matter, and contained only one stone, 

 larger than any of those in the right, nearly of a triangular figure, with the 

 angles pointed at their extremities. 



Of a large Lake, called Malholm Tarn, near Skipton in Craven, in the County 

 of York. By John Fuller, Esq. Jun. F. R. S. ^^"459, p. 6l2. 



This tarn, or lake, of between 3 and 400 acres, is situated among high hills, 

 by which it is supplied with water, which, after quitting the lake, runs in one 

 stream for 2 or 300 yards, then sinks into the ground at two different places, 

 which it is probable afterwards emerge, and immediately join the river Air. 



Concerning a File rendered Magnetical by Lightning. By M. de Bremond, 



M.D. N°459, p. 6 14. 



In N° 437 of these Transactions, is given an extraordinary effect of light- 

 ning, which communicated magnetism to several iron tools. The following, 

 from the coast of St. Andre in Dauphine, in 1739, gives an account of a fact 

 of the same nature. 



Some lightning fell on the house of a clock-maker. The thunder broke one 

 of his files, 4 inches from the end; so that there still remained 7 inches of it 

 in the handle; and the piece of 4 inches long, that was broken off, remained on 

 the shop-board. Using the broken file afterwards, it was found to attract iron 

 very strongly, like a magnet. But it was remarkable that this quality was given 

 only to the inside of the file, at the broken part ; for bits of iron applied to 

 every side of it, had no effect, the virtue residing no where but in the place 

 that was broken. Having broken in two the same piece of 4 inches, one of 

 the two pieces attracted iron at both ends, the other only at its broken end. 

 Rubbing the point of a knife on one of these two bits of the file, it com- 

 municated to the knife a degree of magnetism sufficient to raise needles, and 

 hold them suspended. 



