VOL. XV,] PHILOSOPHICAL TRANSACTIONS. l6f 



the like effects on air as on water, namely, that it expands with freezing, or if 

 in the quicksilver there be lodged particles of water as well as of air; we have 

 in either way an account of this phenomenon. For then the small particles, 

 whether of air or water, lodged in the quicksilver, being thus expanded by 

 freezing, will make the quicksilver swell and so stand higher, without increasing 

 its weight, and consequently without arguing a greater weight of external air 

 pressing on the stagnant quicksilver. 



Description of a Stone of the Bladder, shown to the Royal Society, Feb. 25, 



1684-5. N° 171, p. 1015. 



This stone is said to have been taken out of the bladder of one Francis Dugood, 

 of Auchenhove, in Aberdeen, who died at 50 years of age. The length of the 

 stone was 5^25- inches, the diameter 3-^, the weight 2 lb. 3 oz. 6 dr. 



Account of an Aqueduct designed for carrying the River Eure to Versailles. 



N°171, p. 1016. 



The aqueduct intended to be made near Maintenon, for conveying the river 

 Eure to Versailles, will be in length 7OOO fathoms, of which 462 will be 35 

 fathoms, 4 feet high ; the rest will be lower according to the difference of the 

 ground, but not less than 5 feet and 6 inches high. There will be to the said 

 aqueduct 86 1 arches; which, where they are highest, will be 12 fathoms in 

 breadth, and 8 fathoms in thickness, diminishing to 14 feet at the top. The 

 other arches will be less in breadth as well as thickness, according to the nature 

 of the ground. The said aqueduct will have 15 inches fall to every 1000 fa- 

 thoms in length, so that for the 7 000 fathoms there will be 8 feet 8 inches fall. 

 There are 14000 soldiers that work at it, under the command of the Marquis d' 

 Uxello, with 3 commissaries of war for their conduct, together with treasurers, 

 pay-masters, and victuallers. 



Account of an old Earthen Vessel, lately found near York. N° 171, p. 1017. 



This earthen vessel, supposed by some to be an urn, by others to be a flower- 

 pot, was found lately at the brick-kilns without Bowthant Bar, near York. 

 The clay of it is of the colour of Halifax clay when burnt. On the middle of 

 the side is a face of the size of a woman's, well performed, the face being 

 bossed from within with the finger, when upon the wheel; having some streaks 

 of red paint about the curls of the hair and eye-brows, and two red threads about 

 the neck. On the back part of the vessel a leaf is drawn in red, which is still 

 very fresh, but no glazing, neither on the clay nor red colour. The vessel is 

 preserved in the Ashmolean Museum at Oxford. 



