408 



INDEX. 



Newport (G.), notes on the impregnation 

 of the ovum in the amphibia, 171. 



, on the impregnation of the ovum 



in the amphibia (2jid series revised), 

 214. 



Nile valley, rate of formation of ; alluvial 

 land in, 238 ; excavations in, 346. 



Nitric acid, action of, on various vegeta- 

 bles, 3. 



produced by ammonia, 23. 



Nitrification, some remarks on, 22. 

 Nitropicric acid, obtained from numerous 

 plants, 5. 



Nitropopulic acid, how obtained, its for- 

 mula, 4. 



Nitrotoluylic acid, products of decomposi- 

 tion of, 373. 



Noad (H. M.) on some of the products 

 of the decomposition of nitrotoluylic 

 acid, 373. 



Nobert (T. A.), description and purpose 

 of the " interferenz-spectrum," 43. 



Northampton (Marquis of), obituary no- 

 tice of, 1 17. 



O'Brien (Rev. M.), researches in symbo- 

 lical physics, 76. 



Oliveira (M.), Sur la theorie de I'orienta- 

 tion du plan oscillatoire du pendule 

 simple, &c., 396. 



Organic bases, molecular constitution of ; 

 new alkaloids or ammonium bases, 

 their properties, 42 ; effects of, 43. 



Ova of fishes, different in different 

 species, 149. 



Ovule in ifallopian tube of unimpregnated 

 female, 55 ; escape of, from ovary during 

 menstruation, 56. 



Ovum, impregnation of, 82 ; effect of 

 chemical solutions on, dependent on 

 sperm-force, 83 ; segmentation, first 

 direction of, 84. 



, penetration of, by spermatozoa, 



171,295. 



. direct agency of spermatozoon on, 



214. 



Owen (R.) on the exogenous processes 



of the vertebrae, 8. 



on the megatherium, Pt. II., 57. 



, summary of his discoveries; Copley 



medal awarded to, 103. 

 , description of some species of the 



extinct genus Nesodon, 272. 

 Oxygen, action of, in human body, 23. 



Parallax, investigation of, by observations 

 of 19 stars, 13. 



Pendulum, experiment with, to show ro- 

 tation of earth, 66. 



, experiments on deviation of plane 



of vibration of; apparatus used in York- 



minster, 78 ; tables of results, 79 ; 

 formula of, 80. 

 Peirce (B.), elected foreign member, 

 229. 



Pereira (J.), obituary notice of, 357. 



PhilHps (J.), experiments made at York 

 on the deviation of the plane of vibra- 

 tion of a pendulum, 78. 



Photographic image, instantaneous, to 

 obtain, 82. 



Pictures on the retina, their endurance, 

 colours and changes, 380 ; method of 

 production of, 381 ; effects of light on, 



382 ; general facts of, 383. 



Plants, periodical development of, at dif- 

 ferent heights, 12. 



, new method of propagating, 367 ; 



table of results of ; effect of chemical 

 solutions on, 377. 



Pollock (Sir F.), a proof (by means of a 

 series) that every number is composed 

 of four square numbers, or less, with- 

 out reference to the properties of 

 prime numbers, 132. 



— — on certain properties of square 

 numbers and other quadratic forms, 

 with a table by which all the odd num- 

 bers up to 9211 may be resolved into 

 not exceeding four square numbers, 



383 ; supplement, 387. 



Porter (G. R.), obituary notice of, 256. 



Power (J.), theory of reciprocal action 

 between solar rays and the different 

 media by which they are reflected, 

 317. 



Powell (Rev. B.), remarks on certain 

 points in experiments on the diffrac- 

 tion of light, 160. 



Pseudoscope, phenomena of, 140. 



Quadratic forms, on certain properties 



of, 383-387. 

 Quetelet (A.), Sur les ondes atmospheri- 



ques, 74. 



Rain, experiments on fall of, in lake 

 district, 34 ; great fall of, 35 ; obser- 

 vations on, 170. 



, gTcat fall of, near London, 39 ; in 



England and Ireland, 40 ; caused by 

 wind currents, 41. 



, large amount of, in 1852, 290. 



, effects of, at Mourzuk, 374. 



Rainey (G.), description of a muscle of 

 the striped variety, &c., 23. 



Rankine (W. J. M.), application of the 

 law of the conservation of energy to 

 the determination of the magnetic me- 

 ridian, &c., 303; additional remarks 

 on, 304. 



, on the geometrical representation 



