586 



INDEX. 



Perezia Wislizeni, Gray, 58. 



Wrightii, Gray, 60. 

 Perityle, 18, 19. 

 Pliacelia Orcuttiana, 88. 

 pachypliylla, 88. 

 Parisliii, 88. 



Popei, Torr. & Gray, 87. 

 Phases of the i\Ioon, 310. 

 Phenoxybromaciylic acid, 264. 

 Phenoxybromacrylate, argeutic, 260. 

 baric, 265. 

 calcic, 266. 

 potassic, 265. 

 Phenoxybrommaleic acid, 267. 

 Phosphorous anilid, 226. 



properties, 227. 

 Phospliorous trichloride, action of, 



on aniline, 222. 

 Phosi:>horic oxychloride, action of, 



on curcuniin, 213. 

 Photography of planetary and stellar 

 spectra, researches upon the, 

 231. 

 Pig, on the development of the pos- 

 terior fissure of the spinal 

 cord, and the reduction of 

 the central canal, in the, 97. 

 Plateilema, 31. 

 Plp^vpteris, DC, 14. 

 Plectritis, Lindl., 83. 

 Plumbic orthoiodtoluolsulphonate, 



294. 

 Polemoniaceai, 87. 

 Polypteris, Nutt., 30. 

 Posterior fissure of the spinal cord 

 in the pig, 97. 

 literature, 97. 

 material, 101. 

 observations, 101. 

 resume, 107. 



table of measurements, 108. 

 explanation of table, 108. 

 explanation of plates, 109. 

 Poroi>hylluin coloratum, DC, 30. 

 Ervendbergii, 35. 

 filifolium, 35. 

 gracile, Benth., 36. 

 Linaria, DC, 36. 

 oljtusifolium, DC, 35. 

 JSeemanni, Schultz Bip., 35. 

 snffruticosum, 36. 

 viriditlorum, DC, 35. 

 Potassic /3-bromdichloracrylate, 292. 

 a-chlordibromacrylate, 284. 

 /3-clilor(lil)romacrylate, 288. 

 ^-dibromdichlorpropionate, 290. 



Potassic mucophenoxybromate, 263. 



phenoxybrouiacrylate. 265. 

 Principal argument, absolute criti- 

 cal temperature in terms of 

 the, 455. 

 in terms of the expansion for 0° 



Centigrade, 454. 

 variation of the, with the tem- 

 perature, 459. 

 Probability of errors, table of the, 

 434. 

 table of the logarithmic, 435. 

 Psathyrotes pilifera, 50. 

 Pterophyton. Torr. & Gray, 12. 

 Ptilomeris, 23. 



R. 



Rowland, Professor, presentation of 



Rumford Medal to, 478. 

 Rubiacese, 77. 



Rumford Medal, presentation of, to 

 Professor Rowland, 478. 



S. 



Sabine, Sir Edward, notice of, 560. 

 Sambucus melanocarpa, 76. 

 Saracha umbellata, DC, 91. 

 Sartwellia Mexicana, 34. 

 Schkuhria, Roth., 27. 

 .Schmidt, evening observations, 198. 

 Sthniidt. J. F. J., notice of, 564. 

 Scrophulariacese, 92. 

 Senecio, 54. 



aureus, L., 55. 



cardaniiue, Greene, 54. 



Clevelandi, Greene, 54. 



crassulus, 54. 



Hartwegi, Benth., 54. 



Iluachucanus, 54. 



lobatus, Pers., 55. 



Madrensis, 55. 



Keo-Mexicanus, 55. 



petrajus, Klatt, 54. 



rugelia, 54. 



salignus, DC, 55. 



M'ernerifEfolius, 54. 



A\'lii])]il('anus, 54. 

 Senecioni(le;v\ 50. 

 Silphium albiflorum, 4. 

 Siplionella, Krok, 82. 

 Smitli, J. l^awrence, notice of, 535. 

 Solanaceaj, 91. 



