VOL. LVI,] PHILOSOPHICAL TRANSACTIONS. 359 



sufficient to make her apply for advice, till Nov. 1 762, when she was seized with 

 a much greater degree of the same kind of pain, attended with difficulty of res- 

 piration, a sense of weight on the diaphragm, and a quick pulse, with a little 

 more heat than usual. 



On the 18th of Dec. Mr. W. saw her, for the first time, with Mr. Mills, a 

 surgeon at Greenwich, when she related to him the above complaints, now much 

 augmented, having a sense of fulness in that side (which was ready to burst, as 

 she termed it) and an evident fluctuation in the right cavity of the thorax. But 

 her left side was free from complaint. She made very little urine, and that lim- 

 pid. The expectorant medicines (blister and cathartic) were administered without 

 the least relief; her symptoms gradually increasing. On the 1st of Jan. 1763, 

 she could breathe in no other situation than that of the thorax brought forward 

 to the knees, in which posture she continued till the 30th of Jan. when finding 

 the ribs elevated exceedingly, and the right side of the thorax uniformly distended, 

 with every other reason tending to confirm the notion of a fluid's being lodged 

 there : they, in company with Mr. William Sharp (whose opinion they had this 

 day requested) proposed the operation to her, which the present pressure of her 

 disease, and the little probability of her living long in that state, determined her 

 to consent to. 



Mr. M. then, in presence of Mr. William Sharp, surgeon to St. Bartholo- 

 mew's, and Mr. Mills, made an incision, about 4 inches long, between the 6th 

 and 7th ribs, (reckoning upwards) and about half way between the spine and 

 sternum, into the cavity of the thorax, and thence discharged 7 pints of limpid 

 serum. Immediately the difficulty of breathing was removed, but a faintness 

 succeeding seemed to endanger her for a short time, occasioned more by the sud- 

 den removal of the pressure from the lungs, than any other inconvenience from 

 the operation, the loss of blood being very inconsiderable. From this time to 

 the next morning, the urine was secreted and discharged to the quantity of 3 

 pints more than she had drank. On the first dressing, the next day, there issued 

 about a spoonful of serum, but none afterwards ; and though she remained weak 

 and faint for several days, yet she had no other inconvenience, from the time of 

 the operation to that of the cicatrization of the wound, which was completed in 

 less than a month ; the wound having been dressed superficially the whole time. 



It may be remarked, that though at the time of the operation she was 2 

 months gone with child, she completed her pregnancy, and is now in as good a 

 state as she had enjoyed for many years before. 



XXXIX. A Supplement to the Account of the Discovery of Native Tin, Art. 

 FlI. By the Rev. fViUiam Borlase, LL. D., F.R.S. p. 305. 

 " Mr. Henry Rosewarne, of Truro, says, that when he sent the first speci- 



