p. 



Teacock^ Mr. James. ?)Ct,/4rchite^ure, &c. 



Phlogifiicatcd Air^ whether many different fubflancci are not in rctlity confounded toge- 

 ther under this name, p. 381. 

 PhlogiJIon. See Ah: 

 Phofphoric Light, See CombuJlloH, 

 Pigott, Edward, Efq. See Fariahle Starsr 

 Polypus^ has no anus, p. 341. 

 Price, Dr. See Comhufiion, 

 Priejlley, Rev. Jofeph. See Air, and Water* 

 Pringle^ Col. See Bafe, 

 Pyrometer, See Bafe, 



R. 



B.ain* See Barometer, &c. 



Ramfderty Mr. his curious beam compafles, p. 402. See Bafe, His ca(y and fimple 

 way •£ obtaining the fcale of his pyrometer, p. 471. 



Reed'-xvren, See Motacilla. 



Richmond, in Surrey, method of boring for water there, p. 6. 



Riga Red-vjotd, more fufceptlble of the eftefts of moillure than New-England white-' 

 wood, p. 435. 



Rotatory Motion. Of the Rotatory Motion of a Body of any Form whatever, revolving, 

 without Rellraint, about any Axis palfing through its Center of Gravity, by Mr. 

 John Landen, p. 311. When the axis, about which a body is made to revolve, is not 

 a permanent one, the centrifugal force of its particles will didurb its rotatory motion, 

 &c. p. 312. To determine in what track, and at what rate, the poles of fuch mo- 

 mentary axis will be varied, not an uninterefting proportion, ibid. The folutions 

 of that problem by M. Leonhard Euler, M. D'Alembert, and M. John Albert Euler, 

 reftified by the author, ibid. Difference between him and the above gentlemen con- 

 cerning the angular velocity and the momentum of rotation, p. 313. How to find a 

 parallelopipedon that being by fome force or forces made to revolve about an axis, 

 with a certain angular velocity, fhall move exadly in the fame manner as any other 

 given body, if made to revolve with the fame force, about an axis paffing through 

 its centre of gravity, p. 315. Tab. X. fig. i. explained, ibid. Method of finding 

 how a parallelopipedon will revolve about fuccefTive momentary axes pafTing through 

 its center of gravity, p. 318. Fig. 2. and 3. explained, p. 318. 322. Fig. 4. ditto, 

 p. 321. Fig. 5. ditto, ibid. Errors of M. Euler pjiuted our, p. 327, 328. To 

 which M. D'Alembert's feem nearly fimilar, p. 328. 



6 Rtuitr^ 



