( ) 
O. 
Old Age. See Aged Perfons. 
Optick, Nerve wafted, p- 281. Optick Nerve crufti’d flat, 
p . 282. 
Qfcillation. See Mathematics . 
Offification cf the firft Procefs of the Dura Mater , and of 
the Mufcular Fibres of the Heart , p. 281. 
P. 
Pericardium adhering to the Heart, p. 281, 
Petrifying Quality of the Water of Lough- Neagh exa- 
mined,/'. 260. 
Phofphorus . See Light . 
Plague. Remarks upon the Plague at Copenhagen in the 
Year 171 f, p. 279.. A Defcription of the Plague at 
Dantzick, in the Year 1709, p. 101. &c. An Account 
of its Approach, p. 101, 102. Precautions taken a- 
gainft it, p . 102. The Number of thofe that died of 
it, p. 107. Its Progrefs and Increafe, p. 108. The 
Plague of a Poifonous Nature, p. 110. The Air in- 
fected in time of the Plague , p. in. Signs forerun- 
ning the Plague y p. 114. External Symptoms of the 
Plague , p. 1 1 7. Internal Symptoms, p. 121. Prog- 
nofticks, p. 123. Pra&ical indications, p. 126. Sim- 
ple Internal Medicines, p. 127. Compound Internal 
Medicines, p. 136. External Medicines, p. 138. Chi- 
rurgical Operations, p. 141. 
Planets. See Agronomy. 
Plants. An Account of rare Plants in feveral Gardens 
about London , p. 33. 177. Uncommon Plants obferved 
in Wales , p. 93. 96. Uncommon Plants obferved in 
Scotland , p. 100. 101. The Defcription of a Tarta- 
rian Plant called Gin-fyng > with an Account of its 
Virtues, 
