448 I'HILOSOPHICAL TRANSACTIONS. [aNNO ] 73 1 . 



nephritic attacks, and at times voided by the urethra, with excruciating pain, 

 a great number of calcuh, several of which were larger than a pea; but about 

 4 years since he felt all the symptoms of stone in the bladder. In 1728, after 

 the use of various medicines (at the same time constantly taking for his common 

 drink a kind of Brunswick beer, called duchstein, in high repute for the stone 

 and on that account exported abroad) he sometimes felt violent pains in making 

 water, accompanied with strong contractions of the bladder, and a sensation as 

 if one or more calculi were broken in it. liDinediately after this he voided vvith 

 his urine some pieces of a broken calculus, and this he continued doing for 

 several days after; till at length they were all discharged. His pain then left 

 him. as well as every other symptom of the stone. The patient declared that 

 he had voided above 100 pieces of broken calculi, some of which were half as 

 large as one's thumb, but many of them were smaller; their external surface 

 was convex, the internal of most of them concave ; some of them exhibited 

 the nucleus of a stone. The number and appearance of the pieces of broken 

 calculi prove that they came from the bladder, and that they had once formed 

 whole stones there, which were afterwards broken and discharged; but whether 

 by means of the medicineSj or of the beer, or by the force of nature, Dr, H. 

 could not determine. From the convexity of the segments of the pieces which 

 came away, it may be inferred that very few of the stones were larger than a 

 nutmeg, and that several of thein were smaller. 



Concerning the Frost in January 1730-1. By the Rev. Wvi. Derham, D. D. 

 Canon of /Vindsor, and F. R. S. N° 417, p. l6. 



In the Phil. Trans. N° 324, Dr. Derham gave an account of some of the 

 most remarkable frosts he could find any account of; and particularly of that 

 great, and he had almost said universal one, in 1708, which the Royal Society 

 had very good histories of from divers parts, and which he in that N" had taken 

 from the original papers. 



He there made it very probable, that the greatest descent of the spirits in the 

 thermometer, was on Dec. 30, 1/08, when the spirit in his tube was within-^ 

 of an inch as low as it is with artificial freezing with snow, or ice and salt; and 

 in the frost in Jan. 1730-1 it was almost, if not altogether, as low. 



The freezing point of his thermometer is 10 inches, which he calls ICO de- 

 grees, above the ball; and the most intense freezing, according to the methods 

 mentioned in that Transaction, is just at, or very little within the ball. And 

 on Jan. 30, about sun-rise, the thermometer was but an inch, or 10 degrees 

 above the point of extreme freezing; and on Feb. 3, only at -^ an inch, or 5 

 degrees. And considering that the thermometer he observed with in 1 708 was 



