312 



SECTIONS. INDEX OF SUBJECTS. 



tlieir investigation, by Ecv. Dr. Scoresby, 

 1853, 22. 



Spar, calcareous, Sir D. Brewster on the 

 cause of the white rings seen round a lu- 

 minous body when looked at through, 

 1844, 9. 



Spasmodic diseases, Dr. E. D. Thomson on 

 the use of hydrocyanic acid in, 1841, 



54- 



Species, Eev. L. Jenyns on the variation of, 

 1856, 1 01. 



, Prof, Draper on the intellectual deve- 

 lopment of Europe, considered with re- 

 ference to the view of Mr. Darwin and 

 others on, 1860, 115. 



Spectacles, on the focal length of, by J. I. 

 Hawkins, 1837, 132. 



Spectra of various flames. Sir D. Brewster 

 on the luminous bands in the, 1842, 15, 



Spectral phenomena, apparatus for exhibit- 

 ing optical illusions of, by H. Dircks, 

 1858, 14. 



Spectrum, Eev. Prof. Challis on some facts 

 relating to the composition of the colours 

 of the, 1834, 544. 



, Prof. Powell's measures of the indices 



of refraction for the lines G and H in the. 

 Sir D. Brewster on, 1840, 5. 



, Sir D. Brewster on a new property of 



the rays of the, 1842, 12. 



, on the determination of the wave- 

 length corresponding with any point of 

 the, by Prof. Stokes, 1849, 11. 



, Prof. Helmholtz on the homogeneous 



colours of the, 1853, 5. 



, Sir D. Brewster on the triple, 1855, 7. 



, on the mixture of the colours of the, 



• by Prof. J. C. Maxwell, 1859, 15. 



, colours of the. Prof. J. C. Maxwell on 



an instrument for exhibiting any mixture 

 of the, 1860, 16. 



, prismatic. Sir J. F. W. Herschel on a 



remarkable property of the extreme red 

 rays of the, 1839, 9. 



, prismatic, Prof. W. A. Miller on the 



action of gases on the, 1845, 28. 



, prismatic, Eev. Prof. Powell on the 



bands formed by partial interception of 

 the, 1846, 4. 



, solar. Sir D. Brewster on the structure 



of a part of the, hitherto xmexamined, 

 1842, 15. 



, solar, Sir D. Brewster on the dark 



lines in the portion of the red space be- 

 yond the red extremity of the, as seen by 

 Fraunhofer, 1847, 33. 



, solar, on the fixed lines of the, by Dr. 



J. H. Gladstone, 1858, 17. 



, solar, on the law of the wave-lengths 

 corresponding to certain points in the, by 

 M. Ponton, 1859, 20. 



Specula of telescopes. Dr. E. Greene on po- 

 lishing the, 1843, II. 



• of silver for reflecting telescopes. Earl 



ofEosseon, 1851, 12. 



of reflecting telescopes, J. D. Sollitt on 



the composition and figuring of the, 1853, 

 10. 



Specula for reflecting telescopes and lenses. 

 Dr. E. Greene on a machine for polishing, 

 1856, 24. 



Speculum, large, W. Lassell on a method of 

 supporting a, 1850, 1 80. 



, telescope, of silvered glass, L. Foucault 



on a, 1857, 6. 



Speech by mechanical means. Prof. Wheat- 

 stone on, 1835, 14. 



Spergula vulgaris, new to the English flora, 

 notice of, 1839, 92. 



Spermaceti, on the effect of pressure on the 

 temperature of fusion of, by W. Hopkins, 

 1854, 58. 



Spermatozoa, on the physiology of the, by 

 Prof. KoUiker, 1855, 125 



in Ascaris mystax. Prof. Allen Thom- 

 son on the, 1855, 138. 



Spharodus, Prof. Owen on the teeth of the 

 extinct genus, 1838, 142. 



Sphene, examination of, by T. Eichardson, 

 1838, 49. 



Sphenopteris Hookeri, a new fossil fern, 

 from the upper old red sandstone forma- 

 tion at Kiltorkan Hill, co. of Kilkenny, 

 W. H. Baily on, 1859, 98. 



Sphere, on the geometrical projection of 

 two-thirds of the surface of the, by Col. 

 Sir H. James, 1858, 151. 



Spheroid, rotating, on the conditions of equi- 

 librium in a, by Dr. Siljestrom, 1858, 5. 



Spheroidal state of bodies, and its applica- 

 tion to steam boilers, M. Boutigny on the, 

 1845, 27. 



state, on the cause which maintains 



bodies in the,beyond the sphere of physico- 

 chemical activity,by M. Boutigny, 1851,44. 



Spiders, J. Blackwall on the structure and 

 functions of, 1833, 444. 



, J. Blackwall on the palpi of, 1842, 66. 



, J. Blackwall on a species of Ichneumon 



whose larva is parasitic on, 1842, 68. 



, British, notice of J. Blackwall's work 



on, 1860, 120. 



Spina bifida, Mr. Evans on a case of, 1839, 

 loi ; Dr. Thurnam on a case of, 1845, 86. 



Spinal chord, a sensational and volitional 

 centre, by G. H. Lewes, 1858, 135. 



Spine, S. Hare on the curvature of the, 1837, 

 114. 



Spines, on some peculiar forms of, found in 

 two species of spinigrade starfishes, by 

 C. W. Peach, 1858, 128. 



Spiraea ulmaria, Dr. Ettling on the oil of, 

 1840, 78. 



Spirals, on an instrument for describing, by 

 Eev. Dr. Booth, 1858, 207 ; 1860, 60. 



Spirits, W. Black on a method of ascertain- 

 ing the strength of, 1836, 61. 



Spiroilous and saliculous acid. Dr. Ettling 

 on the identity of, 1840, 78. 



Spirometer, notice of a, 1858, 143. 



Spirule or Eam's Horn (Cephalopod), on the 

 formation of the shell of the, 1846, 82. 



