.12 I'HILOSOPHICAL TRANSACTIONS. [aNNO 1724. 



therein almost to the point a; after which, the tube is hermetically sealed 

 near e, and the instrument weighed in a nice pair of scales; and the weight 

 of the instrument will be the very same with that of the liquor, excluded 

 by the instrument, as is well known from hydrostatics. But if the weight 

 of heavier liquors, as water, lixivia, or acid spirits, be sought, their difference 

 of gravity is found, when the instrument is charged with so much weight in 

 the receptacle g, as may make it descend again to the point a. On adding 

 this weight to that of the instrument, the specific gravities of these liquors, 

 if the weights be very small, will be had sufficiently exact : and so of 

 the rest. 



M. Fahrenheit affirmed that the instrument should descend in the above- 

 mentioned spirits almost to the point a ; but it will be better that the liquor 

 do not exactly reach that point, and that the inconsiderable difference be 

 made up by very small weights ; for, in this manner, were there still lighter 

 liquors proposed, or were the gravity of the abovementioned liquors rendered 

 specifically lighter by heat, they might still be discovered by the instrument, 

 which otherwise would not happen, should it descend in the said liquors exactly 

 to the point a. 



In making the experiments, care is to be taken, that neither the super- 

 ficies of the instrument, nor of the liquors, have any fat, or other hetero- 

 geneous p;)rticles adhering to them; else the experiments can never be ac- 

 curately made. 



On the preternatural Structure of the Pudenda in a fVoman, described in Philos. 

 Trans. N° 379. By Mr. John Bonnet, Surgeon at Fowey, in Cornwall. 

 W 384, p. 142. 



As there appears to be some difference in the accounts of the remarkable 

 structure of the pudenda, &c. of the woman of Lanteglass, near Fowey, pub- 

 lished in the Philos. Trans. N° 379, Mr. B, gives this particular account of 

 what he observed with respect to this matter. 



The woman was about 23 years old when she was married, and some time 

 after she conceived. As she was conscious of the preternatural structure of 

 the parts, and her mother apprehensive of the danger that would attend the 

 delivery under such unhappy circumstances; they applied to Mr. B. about the 

 7th month, in order to engage his assistance. On viewing the abdomen, he 

 found no sign of the umbilicus ; but about 3 inches lower than the regular 

 place of it, there was a spongy, fleshy extuberance, nearly of the shape and 

 size of a hen's egg; not, as is said in Mr. O.'s account, composed of many 



