//. Index of Subjects. 421 



Series, Self-repeating : May 15, 1854 ; ix. 471 — 486. 



■- Theorem on Neutral : May 16, 1864 ; xi. 190—202. 



■ Ditto, Part II.: May 7, 1866; xi. 239—266. 



Note on Ditto : Oct. 26, 1868 ; xi. 447—460. 



Sextic Torse, On a certain : Nov. 8, 1869 ; xi. 507 — 523. 

 Shells, Occurrence of, in Gravel : Apr. 30, 1838 ; vni. 138 — 140. 



Signs, Influence of, in Mathematical Reasoning : Dec. 16, 1821 ; ii. 325 — 377. 



+ and -, Early History of: Nov. 28, 1864; xi. 203—212. 



Note on this Memoir: Feb. 13, 1865; xi. 213—218. 



Skew Surfaces, or Scrolls: Nov, 11, 1867; xr. 277—289. 

 Slags, Crystals found in: March 22, 1830; in. 417—420. 

 Solid Bodies, Vibrations of: Apr. 18, 1864; xi. 324—359. 



Solitary Waves, Mathematical Theory of: Dec. 8, 1845; viii. 326—341. 



Solon, Statue of: Feb. 22, 1858; x. 231—239. 



Sound, Experiments on the Velocity of: Dec. 8, 1823; ir. 119 — 137. 



see Motion of Particles. 



Reflection and Refraction of: Dec. 11, 1837; vi. 403—413. 



Spar-Fluor, Double Crystals of: Nov. 26, 1821; i. 331—342. 

 Spermaceti Whale, account of: May 16, 1825; ii. 253—266. 



Sphere, Motions of, acted on by Vibrations of an Elastic Medium : April 26, 



1841 ; VII. 333—353. 

 Spherical Aberration in Eye-pieces of Telescopes : May 14, 21, 1827 ; ill. 1 — 63. 

 Spheroids differing little from a Sphere, on Laplace's Theory of: May 8, 1826 ; 



II. 379—390. 

 Squares, Method of Least : March 4, 1844 ; viii. 204 — 219. 



Ditto, Ditto : May 29, 1865; XL 219— 238. 



Suffolk, see Gipping. 



Surfaces of the second degree. Equation to: Nov. 12, 1832; v. 77 — 94. 



Transformation of, by Bending: March 13, 1854; ix. 445 — 470. 



Suspension Chain, Oscillations of: Dec. 8, 1851; ix. 379 — 398. 

 Switzerland, Tertiary Formations of: May 20, 1839; vii. 141 — 152. 

 Syllogism, Theory of the structure of: Nov. 9, 1846; viii. 379 — 408. 



Ditto, Ditto, Pt. IL: F«b. 25, 1850; IX. 79— 127. 



Ditto, Ditto, Pt. III.: Feb. 8, 1858; x. 173—230. 



Ditto, Ditto, Pt. IV.: Apr. 23, 1860; X. 331— 358. 



Ditto, Ditto, Pt. v.: May 4, 1863; X. 428— 487. 



Symbolical Geometry and Mechanics : March 15, 1847 ; viii. 497 507. 



Tertiary Formations of Switzerland : May 20, 1839; vii. 141—152. 

 Testimony, Measure of Force of: Nov. 27, 1843; viii. 143 — 158. 



Theory of Probabilities, Question in : Feb. 26, 1837 ; vi. 423 430. 



Topaz, see Brazilian Topaz. 



Transcendental Equations, Machine for resolving: May 7, 1832; iv. 425 440. 



Trap Dykes in Yorkshire and Durham : May 20, 1822 ; ii. 21 ^44. 



Rocks, as associated with Mountain Limestone: May 12, 1823: March 



1, 15, 1824; II. 139—195. 



