PER 



hone, giving them fuch an inclination as to make the angle 

 on which the vibrations arc performed about 120 degrees. 

 Before the knife-edges were hardened, each was tapped 

 half-way through, near the extremities, to receive two 

 fcrews, which being paffed through the knee-pieces, drew 

 the knife-edges into clofe contad with them ; the furfaces 

 of both having been previoufly ground together to guard 

 againll any ilrain which might injure their figure. For 

 the defcription of the fupport and other apparatus of this 

 pendulum, illuftrated by drawings, and the method of 

 determining the experiments, and certain other obferva- 

 tions, our limits require us to refer to the Phil. Tranf. for 

 the vear 1818, pt. i. . . ^ 



From his experiments and obfervations, captain Kater 

 concludes, that the length of the pendulum vibrating feconds 

 in vacuo at the level of the fea, meafiired at the tempera- 

 ture of 62° of Fahrenheit, appears to be 



inches. 

 39,13860 



39.'37i7 

 39,13842 



By fir G. Shuckburgh's ftandard 

 By general Roy's fcale 

 By Bird's parliamentary ftandard 

 The latitude of the place of obfervation being 51° 31' 8",^ 

 north. 



PENKRIDGE. In 181 1 this towtifhip contained 196 

 lioufes, and 923 perfons ; "viz. 438 males, and 485 females. 



PENN's, 1. 2, r. 3798. Add— Alfo, a townfhip of 

 Northumberland county, having 2072 inhabitants. 



Pexn'j Ned, 1. 2, add — Upper Perm's Neck contains 

 1638, and the Lower 1163 inhabitants. 



PENNSBOROUGH, East. Add— containing 2365 

 perfons. 



Pennsborough, Weft. Add — It contains 1264 perfons. 



PENNSYLVANIA, 1. 7, add— By the cenfus of 1810, 

 the number of counties is 4^, the five following counties 

 having been added ; ris. Cambria, Indiana, Qearfield, 

 Jefferfon, Tioga, Potter, M'Kean, and the city and county 

 of Philadelphia being feparated. The number of inhabitants 

 is ftated to be 810,091, including 795 flaves. See each 

 county, and United States. ■ 



PENOBSCOT, 1.5, r. 1302. 



PEORIA, a townlhip of St. Clair, hi the Illinois terri- 

 tory, having 93 inhabitants. 



PEPPERELL, 1. 4, r. 1333. 



PEQUANOCK. Add— containing 3853 inhabitants. 



PERCHLORIC Acid, in Chemiftry. See Chlorine. 



PERGASITE. See Mineralogy, Addenda. 



PERICARDIUM, Liquor of. Chemical Compofition of. 

 See Fluids, Animal. 



PERQUIMINS, 1.5, r. 6052— 2017. 



PERSIA, col. 8, 1. 18 from bottom, /■. See Persian 

 Language. Col. 13, I. j 2 from bottom, r. Kejer. At the 

 end, r. Kinncir's. 



PERSIAN Gulf, &c. 1. 1, for Omar r. Oman. 



PERSON, 1. 2, r. 6442 ; 1. 3, r. 2573. 



PERSPECTIVE, col. 4, 1. 2, for plane r. line, and 

 infert radial before parallel; 1. 13, for parallel lines r. 

 parallel planes ; 1. 19, for point r. line. Prob. xxi. 

 Meth. I. 1. 12 and 13, the lines which fhould have been 

 drawn from Q to c and d are in the plate improperly drawn 

 from the point 3. Method 8. 1. 3, r. reprefentation. Me- 

 thod II. 1. 13, for and a e, r. and as. 



PERTH, col. 4, 1. 23 from bottom, for 4715 r. 4C10; 

 and after 16,948 inhabitants, r. inx. 7687 males, and 9261 

 females. 



PERTH-AMBOY, 1. 11, r. 815 inhabitants. 



PERTHSHIRE. In 1811 this (hire contained (ex- 

 clufive of the town ) 21,894 houfes, and 1 16,975 perfons • 



7t 



P H A 



viz. SS^'^ll males, and 61,799 females : 8500 families being 

 employed in agriculture, and 9602 in trade, manufaftures, 

 or handicraft. 



Vol. XXVII. 



PERU, in America. Add — Alfo, a town of Berklhire 

 county, in Maflachufetts, containing 912 perfons. — Alfo, a 

 townlhip of Bennington county, in Vermont, having 239 

 inhabitants. 



PERUVIAN, Bark, Chemical Properties of. See 

 Cinchona. 



PETALITE. See Mineralogy, Addenda. 

 PETERSBOROUGH, in America, 1. 3, r. 1537. 

 PETERSBURGH, a town of Huntingdon county, 

 in Pennfylvauia, having 194 inhabitants. Col. 2, 1. 19, for 

 Albert r. Elbert. At the clofe, add — It contains, together 

 with the county and Elberton-town, 12,156 inhabitants ; the 

 flaves of the county being 429i,thofe of the town 225, and 

 thofe of Elberton 58. 



PETERSHAM, 1.6, r. 1490. 

 PETROLEUM. See Mineralckjy, Addenda. 

 PHiENICOPHEUS,MALKOKA, in Ornithology, a genus 

 of birds of the order Picoe ; the characters of which are, 

 beak ftrong and flightly incurved ; feet fimple, two toes 

 pointing forwards, and two backwards, the outward toe 

 the longed ; head naked round the eves and warted. This 

 genus is readily diftingiiifhed from Cuculus by the naked 

 and papillated fpace that furrounds the eyes, and from 

 Polophilus by the ftrufture of the hinder toes ; the 

 head is fomewhat fquare, and very thick ; the wings rather 

 fhort, and the tail remarkably long. Shaw. 

 PHANAGORIA for Phanacmra. 

 PHARMACOPCEIA Equina, a difpenfatory adapted 

 to the purpofes of veterinary praftitioners, and defigned 

 more efpecially to comprehend thofe drugs and medicines 

 that pertain to the difeafes of the horfe. Such a pharma- 

 copoeia i& a defideratuni in veterinary fcience. The drugs 

 and preparations that are chiefly iifed are defcribed, as far 

 as our limits would allow, under their feveral titles on the 

 difarders to which they are appropriated. The form under 

 which they are moft commonly adminiftered is that of balls, 

 under which many of them are recited, and the general 

 method of preparing them defcribed. Veterinai'y writers 

 have arranged thefe balls under feveral denominations, 

 founded on the medical purpofes for which they are admi- 

 niftered. Accordingly we have alleratiite, purging, diuretic,, 

 cordial, ajlringenl, rejlorative, and diaphoretic balls ; for the 

 preparation of which a variety of formulae has been given 

 by modern praftitioners. 



For alterative balls we have the following inftruttions : 

 Mr. J. Lawrence diretts flowers of fulphur and cream of tartar, 

 of each i oz., i dr. of canella alba in powder, and treacle q.f., 

 half of which ball (hould be given twice a day on an empty 

 ftomach : — or, fl'owers of firlphur, cream, of tartar, gum guaia- 

 cum and turmeric, of each 2 drs., and i dr. of canella alba, 

 maybe made into one or two balls with treacle, and given as 

 above : — or, pi-epared antimony and gum guaiacum, of each 

 from 3 to 4 drs. prepared with treacle, may be given every 

 day : — or, antimonial jEthiops, from 4 to 6 drs. made into a 

 ball with treacle, may be adminiftered every night for a fort- 

 night, and difcontinuing it for a week, refumed for another 

 fortnight ; wliich is faid to have great efFeft in the farcy, the 

 mange, and obitinate dry coughs in horfes. Mr. R. Lawrence 

 recommends a ball made ot 1 dr. of tartarifed antimony, 

 1 oz. of liquorice-powder, and ^ oz. of Venice turpentine. 



