472 



INDEX. 



P. 



Paraiodbenzyl Compounds, 202. 

 Paraiodalphatoluylic acid, 205. 



salts, 206. 

 Paraiodbenzyl acetate, 203. 

 alcohol, 203. 

 amines, 207. 

 bromide, 202. 

 cyanide, 204. 

 sulphocyanate, 207. 

 Paris, Societe Botanique de. Com- 

 munication from, 425. 

 Pendulum, Correction of Length, 

 for Flexibility of Support, 

 396. 

 Photographic Action of Dry Silver 



Bromide Collodion, 171. 

 Photoheliograph, Note on the Hori- 

 zontal, 194. 

 Peirce's Criterion, On, 348. 

 Probabilities at the Three-ball 



Game of Billiards, 141. 

 Precipitates, Xew ^lethod for the 

 Separation and Treatment 

 of, 342. 

 Proceedings, 423. 



Pythagorean Doctrine of Numbers, 

 104. 



Q. 



Quadrics, as treated by Quater- 

 nions, 222. 



Quaternions, Investigations in, 

 310. 



R. 



Rhytiglossa viridiflora, 365. 

 Rumford Committee, Appropria- 

 tions, 426, 428, 432. 

 Barometer, Loan of, 428. 



S. 



Saturn's Rings, On, 191. 

 Schaueria linearifolia, 364. 



Silver Bromide Collodion, Photo- 

 graphic Action of, 171. 



Solar Protuberance, Sudden Ex- 

 tinction of the Light of, 187. 



Specific Gravity of Antimony, 17. 



Spectrum, Theory of Absorption- 

 Bands in, 216. 



Spherical Conies, 375. 



Surfaces of the Second Order, as 

 treated by Quaternions, 



T. 



Temple of Zeus at Olympia, Di- 

 mensions and Proportions 

 of, 145. 



Terrestrial Magnetism, Intensity 

 of, at Cambridge, 414. 



Thelesperma simplicifolium, 373. ' 

 subnudum, 373. 



u. 



Undulations in the Tail of Coggia's 

 Comet, 185. 



Upsala, University of. Communi- 

 cation from, 425, 426. 



Uredineae, On the Synonymy of 

 some Species of, 251. 



W. 



Waltham, Mass., on the Longitude 



of, 175. 

 Wright, Chauncey, Description of 



the Brain of, 210. 



Z. 



Zeus, Temple of, at Olympia, 145. 

 Zodiacal Light, the Moon's, 183. 



Cambridge : Press of John Wilson & Son. 



