Index 



279 



Pearls in a cocoa-nut, alleged for- 

 mation of, 232. 



Peirce, J. M. P., account of prepara- 

 tion for observing total solar 

 eclipse on Dec. 22, 186, 187. 



Pendulum observations, anomalies 

 in, near Portsea, 169 ; near 

 Moscow, id. 



Pentacrinus, study of a West Indian 

 specimen, 181. 



Pepsin, action of, on elementary 

 substances, 155. 



Perameles, brain of, and transitional 

 character of the animal, 171. 



Pereira, J., biography of, 18. 



Permo-Carboniferous, traces of a 

 southern land -mass in this period, 

 247. 



Perthes, Dr., old historical manu- 

 scripts discovered by, 145. 



Petherick, Consul, exploration of 

 the Upper Nile, 147, 161. 



Petroleum, American lamp for 

 burning its vapour, 162. 



Phillips, J., biography of, 19. 



Philosophical Club, its foundation, 

 i ; its number, object and rules, 

 id. ; first officers of, 3 ; list of 

 the forty-seven original members, 

 4 ; autographs of, id. ; statistics 

 given at three-hundredth meet- 

 ing, 75 ; discontinuance of, sug- 

 gested, 83 ; joint dinner with 

 Royal Society Club, 86 ; motion 

 for fusion of the two Clubs, 87 ; 

 statistics of membership and 

 attendance, id. ; its jubilee, 91 ; 

 motion for fusion carried, 94 ; 

 fusion of the two Clubs accom- 

 plished, id. ; draft rules passed, 

 id. ; its last dinner, 95 ; summary 

 of its results, id. ; progress in 

 discovery during its existence, 97. 



Photographic plates, acted on by 

 certain metallic and vegetable 

 substances, 251. 



Photographs, a new process in 

 printing, 209 ; demonstrating 

 existence of oxygen in the sun, id. ; 

 composite, applied to represent 

 diseases, 213 ; illustrating the 

 reversal of lines in metallic 

 vapours, 217. 



Photography, applied to astro- 

 nomy, 124 ; used for reducing 

 Ordnance Survey maps, 131, 

 132 ; a sensitive paper for, 144 ; 

 attempts at, in colour, exhibited, 

 167 ; applied to represent 

 articles of military equipment, 

 157 ; to dissections of the nervous 

 system, 158 ; to pathological 

 specimens, id. ; used to produce 

 composite portraits, 206. 



Photometry, a new method of, 159. 



Photozincography, specimens of, 

 exhibited, 149 ; discovery of, 

 150 ; for facsimiles of manu- 

 scripts, 157 ; for reproducing 

 ordinary photographs, 160. 



Pine forest near Ravenna, killed by 

 winter cold, 215. 



Planetary body, movements of 

 one about a centre of force, 173 ; 

 motion and the " three bodies " 

 problem, 245. 



Plantamour, Prof., on barometric 

 observations at Geneva and the 

 Great St. Bernard, 117 ; on sub- 

 stituting zinc for lead in making 

 flint-glass, 118. 



Plants, action of physical agents on, 

 113 ; fossil from Disco Island, 

 126 ; their evidence of climate 

 north of Arctic Circle in Miocene 

 times, 176 ; instrument for mea- 

 suring them, 249. 



Plants, aromatic, see Aromatic 

 plants. 



Platinum foil, dissipated in lumi- 

 nous focus of a mirror, 171 ; 

 spider's thread unharmed but a 

 metallic wire melted, id. 



Playfair, Lyon, election of, 30 ; 

 biographical note on, 31 ; com- 

 munications from, no, 116, 124, 

 131, 173, 197 ; placed on super- 

 numerary list, 76. 



Pliicker, M., experiments by, 107. 



Plumb-line, deviation of a, near 

 Portsoy, 1 66. 



Polarization, plane of, changed by 

 some artificially produced acids, 

 222. 



Polarized light and strained viscous 

 fluids. 193. 



