VOL. XXXVIII.] PHILOSOPHICAL TRANSACTIONS. 055 



other method of making the experiment, by actual measurement; since it may 

 not be easy to determine how much the measure itself, which we make use of, 

 will be lengthened by difterent degrees of heat. 



For these reasons, Mr. Bradley reckons Mr. Campbell's experiment, to be 

 the most accurate of all that have hitherto been made, and the properest to 

 determine the difference of the gravity of bodies in different latitudes; and 

 therefore he subjoins a table he computed from it, that contains the difference 

 of the length of a simple pendulum, swinging seconds at the equator, and at 

 every 5th degree of latitude, with the number of seconds that a clock would 

 gain in a day, in those several latitudes, supposing it went true when under the 

 equator; by means of which, any one may readily compare other like observa- 

 tions with his; and thus discover whether the alteration of gravity in all places 

 be uniform, and agreeable to the rule laid down by Sir Isaac Newton, or not. 



ContinuatioJi of an Account of an Essay toivards a Natural History of Carolina 

 and the Bahama Islands. By Mark Catesby, F.R.S. With some Extracts 

 out of the sixth Set, by Dr. Mortimer, R. S. Seer. N° 432, p. 315. 



Conjectures on the charming or fascinating Power attributed to the Rattle-snake,* 

 grounded on credible Accounts, Experiments, and Observations. By Sir Hans 

 Sloane, Bart. P.R.S. N° 433, p. 321. 



As to rattle-snakes, all accounts agree that by keeping their eyes fixed on 

 any small animal, as a squirrel, bird, or such like, though sitting on the branch 

 of a tree of a considerable height, it shall, by such stedfast or earnest looking, 

 be made to fall dead into their mouths. 



Sir Hans Sloane had a rattle-snake given him. It had lived 3 months before 



* On this subject see some ingenious observations by Professor Barton, of Philadelphia, referred 

 to at p. 642, vol. 6, of these Abridgments. 



