! N D E X. 



Oil and WaUr, the phenomena of, accounted for by 



eleSlive attrailien - - 438, 456 



■I . ■ . - 1 — long ago remarked 



by naturalifts, Pliny, &c. - - 442 



Opake Bodies, caufe of their permanent colours - 147 

 Orichaicum, treatife on it by the Bifhop of Landaff 47 



. probably the fame with brafs - 48 



t . — its etymology - - - 65 



P. 

 Pabula of Plants, what . . - 430 



Paints, appear black, when the tranfmitted light is in- 

 tercepted, and when in thick mafles - J 79 

 Paris, a fubterraneous cavern there - - 377 

 Pajfions, their influence upon fenfation - - 462, 479 

 pERCivAL, Dr. on the quantities of rain which fall at 



diiFerent heights - - - 122 



_ on the perceptive power of vegetables - 130 



.. ■ on the purfuits of experimental philofophy 342 



_ difference of his experiments on fixed air 



from thofe of Pr. Priestley - - 34^ 



•^ — ; fafts and obfervations relative to attraftion 



and repulfion -. - - 445 



— ■ narrative of a collier, buried in a coal-pjt 4S3 



his addrefs on delivering two medals - 5Z«> 



Parry's voyage to Upper Egypt, quoted - 154 



Perfpiration of Plants , - - - - 4^6 

 PhlDg:pn, its folvent po\yers in whitening filk, linen, 



wax, &c. - - - - »93 



«- . the real caufe of many efFeds attributed to 



acids r - - - '9+ 



P/««f 7";w, account of one by lord Kaimes - 137 



Pi,iNY, his account of orichalcum - - - 49 



Punijhment, the ^W of it, to prevent crimes - 112 



the fuhjeEls of it - : 7 3 ' 3 



._ the 7iature of it - - - 3'*^ 



.. the \uU and meafure of it - - 3 '9 



Punijhmtnt' 



