3-10 ' PHILOSOPHICAL TRANSACTIONS. [aNNO 16Q8. 



that they seemed one continued long sound ; which makes me think, that the 

 echo in some vaults is nothing else but the sound tossed between the side walls, 

 and between the top and bottom. This also makes me conjecture, that the 

 reason why stringed musical instruments give a greater and longer sound to the 

 strings than if the strings were fixed to a single board, may be, because the 

 sound is tossed from side to side in the belly of the instrument. 



Further Experiments about Freezing. By Mr. Desmasters. N° 247, p. 439. 



In the account in N° '245, concerning the expansion of water by freezing, 

 the water then used was a sort of rough pump water, which on the effusion of 

 oil of tartar per deliquium immediately turns milky and turbid, and consider- 

 ing the ice made of this water was a sort of very rarefied white ice, I was in- 

 clined to try whether river water, which would readily mix with oil of tartar 

 without the least precipitation, would upon freezing be expanded to the height 

 of the pump-water above-mentioned. In order to which, I filled a glass tube, 

 of almost an inch diameter, with river water to the height of 6 inches, as in the 

 former trial, and putting it to freeze in a mixture of snow and salt, it gained 

 but i of an inch after it was frozen, whereas the pump water got -f of an inch. 

 I observed that while the river-water was freezing, bubbles rose from the bottom 

 of the tube, much the same as in the freezing of pump-water. I likewise took 

 boiled pump-water and having filled the tube with it to the height of 6 inches, 

 and set it to freeze as before, it rose hardly to ^ of an inch above the mark, 

 whereas the same water unboiled rose -|-. 



Account of a Stone bred at the Root of the Tongue, and causing a Quinsej/. By 



Mr. Bonavert. N^247, p. 440. 



Tho. Wood, of Wrotham, was so troubled with a quinsey that he could 

 hardly swallow any liquid. I found the tumor tend to suppuration inwardly 

 about the root of the tongue on the right side, though it was almost as large as 

 an egg outwardly, but without any sign of suppuration there. I ordered him 

 maturating gargles ; and the next day sent my man, and bid him advise him to 

 endeavour to break it with his finger, which the man effected, and brought out 

 of his mouth near the quantity of a quarter of a pint of matter, and with it at 

 last the stone : he had likewise a ranula, and before he had broken the tumour, 

 and spit out the corruption, he could hardly speak. I belie\e this stone to be 

 of the same nature as those generated in the kidneys and bladder. The weight 

 of this stone in air is 7 gr. The weight of the same in water is 3\, and its 

 specific weight compared with water is near as 1 -^V to 1. 



