VOL. XXXIV.] PHILOSOPHICAL TKANSACTIONS. I'lQ 



information respecting these particulars is to be found, not only in this author's 

 chemistry translated into English, but in every modern system of chemistry, it 

 is deemed unnecessary to insert even an abstract of these dissertations. 



Observations of the Eclipse of the Moon, Oct. 10, 1/25, made at Bristol. By 

 John Burroughs, Esq. N° 392, p. 37- 



The cloudy weather prevented seeing the beginning of the eclipse, or ot 



total darkness, but Mr. B. observed, pretty exactly, the first appearance of 



light after the total darkness, and the end of the eclipse; and their respective 



times are as follow, viz. 



Beginning of light . . . . 7*' 3 l'" 20' "/ 



T^ 1 /-I 1- -, ^„ > apparent time. 



End of the eclipse .... 8 29 30 [ '^^ 



Some small time before the renewal of the true light, there appeared a 



remarkable brightness on the eastern limb of the moon, which was also diffused 



about the edge of the moon, to a sensible distance. If others, who are more 



skilled in these affairs, have made the like observation, Mr. B. will no longer 



doubt of the moon's having an atmosphere. 



Part of two Human Skeletons petrified. Communicated in a Letter from John 

 James Scheuczer, M. D. F. R. S. to Sir Hems Sloane, Bart. Vice Pres. of the 

 Royal Society. N° 892, p. 38. An abstract from the Latin 



Of these two petrifactions, which were dug out of a quarry at Oeningen, one 

 exhibited part of a human skull, with the seven vertebrae of the neck; the other 

 a portion of another skull, part of the bones of the face, and \6 vertebrae in a 

 continued series, with the transverse processes to most of them ; also fragments 

 of both clavicles. 



yi Contrivance to avoid the Irregularities in a Clock's Motion, occasioned by the 

 Action of Heat and Cold on the Pendulum Rod. By Mr. George Graham, 

 Watch-maker, F. R. S. N° 392, p. 40. 



As several persons, who have been curious in measuring time, have taken 

 notice that the vibrations of a pendulum are slower in summer than in winter; 

 and have very justly supposed this alteration has proceeded from a change of 

 length in the pendulum itself, by the influences of heat and cold upon it, in the 

 different seasons of the year; with a view therefore of correcting, in some 

 degree, this defect of the pendulum, Mr. G. made several trials, about the 

 year 1715, to discover whether there was any considerable difference of expan- 

 sion between brass, steel, iron, copper, silver, &c. when exposed to the same 



VOL. VII. S 



