vi INDEX. . 



Vol. Fol. 

 OAR Timber, the manner of preparing it to make pipe 



leaves for ca(ks II. 7 



OPTICAL ORGANS, in the eye of a filk- worm's moth I. Ol 



in the eye of a beetle II. 05 



in the eye of a flirimp II. 268 



OPTIC NERVES, in the eye of a large fly II. 08 



P. • 



PAREI R A BR AVA, its root examined I. 224 



PAPER, burnt, a fubftance refembling it, found to be a 



vegetable production I. 218 



PEAT, the nature of that fubftance I. 145 



PEPPER, the nature of it examined . .., II. 277 



PERIWINKLE, the herb, examined I. 221 



PERSPIRATION, infenfible, the Author's obfervations 



refped;ing it II. 255 



PHOSPHORLTS, its appearance examined and defcribed . II. 242 

 POISON of the Viper, as defcribed by Dr. Mead, com- 

 pared with that of the Scorpion. . ; . . I. 13 i 



how emitted by different animals I. 167 



a. 



QUILLS, their formation I. 271 



R. 



RUNNET, its nature and properties I. 154 



RUSHES, their formation II. 298 



S. 



SAGE, wherein its virtue confifts I. 1 05 



SCALES, on the Ikin of the human body defcribed II. 121 



of fifhes, how formed . . .' I. 05 



a means of difcovering their age I. O9 



SCORPION defcribed L 129 



