INDEX. 



655 



Chemistry class at University of Edin- 

 burgh attended by Maxwell under 

 Professor Gregory, and practical 

 chemistry under Mr. Kemp, 107, 126. 

 Chrystal, Professor, associated with 

 Maxwell in committee of British 

 Association for verifying Ohm's law, 

 365, 392. 



Clausius, mathematical investigations 

 suggested by his theory of gases, 

 332, 336, 342, 380, 399, 562, 564, 

 567. 



Clerk, George, afterwards Sir George 

 Clerk Maxwell (great grand- 

 father in the direct male line 

 of J. C. M.), his betrothal and 

 marriage to his cousin, Dorothea 

 Maxwell, heiress of Middlebie, 

 19, 23. 



Sir George (of Penicuik), brother of 

 John Clerk Maxwell and uncle 

 of J. C. M., 322. 



Captain James, paternal grand- 

 father of J. C. M., 3 and note, 22. 

 Mrs. James (nee Janet Irving), 

 paternal grandmother of J. C. 

 M., 4, 21. 



John, of Eldin, brother to Sir 

 George Clerk (J. C. M.'s great- 

 grandfather), and author of a 

 book on naval tactics, 19-21. 

 John (son of the above), a dis- 

 tinguished lawyer and Lord of 

 Session (Lord Eldin), 19, 21 and 

 note. 



Sir John, of Penicuik, elder brother 

 of James (paternal grandfather of 

 J. C. M.), 3, 22. 



Sir John (of Penicuik, Baron of 

 Exchequer), great - great - grand - 

 father in the direct male line of 

 J. C. M., 19. 



John, afterwards John Clerk Max- 

 well, of Middlebie (or Glenlair), 

 the father of J. C. M. (see Max- 

 well, John Clerk). 

 William, brother of Lord Eldin, 

 and friend of young Walter Scott, 

 21 and note. 



William, married Agnes Maxwell, 

 and left only child, Dorothea 

 Maxwell, heiress of Middlebie, 

 who married her cousin, George 

 Clerk, as above, 23. 

 Clerks (of Penicuik), their family traits 



and Coterie- Sprache, 5, 6. 

 note upon their descent and his- 

 tory, 16-22. 



Colour-box, 198, 314, 318, 334, 335, 

 337, 347, 476. 



Colour-blindness, phenomena of, inves- 

 tigated, soon after Cambridge 

 degree, 198. 

 results communicated to Dr. 



George Wilson, 203, 217. 

 account of his investigations, 474, 



482. 



Colours, early questions about, 31. 

 order of ideas upon, 84 note. 

 investigations upon, commenced 

 after the Cambridge degree, 198, 

 209, 211, 212, 261, 268. 

 his triangle of, 209. 

 remarks on Maxwell's investiga- 

 tions, by Professor Stokes, 

 287. 

 lecture upon, at Eoyal Institution 



1861, 315. 



paper upon colour-vision at differ- 

 ent points of the retina, 327. 

 letters to C. J. Monro on colours, 



347, 379. 



Colour-top, 198, 332, 469. 

 Colour- vision, lecture on (B. A. 1870), 



327, 354. 

 account of Maxwell's experiments 



on, 466-491. 



Conical pendulum, MS. on, 87. 

 Craigenputtock, incident of pilgrimage 

 to, 257 note. 



DESCARTES, his ovals identified, with 

 those delineated by Maxwell by 

 new and simpler method, 77, 79, 

 88. 



laws of, 398. 



on matter and extension, 436. 

 Determinism, 434-444. 

 Devil -on -two -sticks, a favourite game, 



65, 117, 129, 135, 251. 

 Devonshire, Duke of, his gift of a 

 physical laboratory to Cambridge, 

 348. 

 Dewar, Principal, of Marischal College, 



Aberdeen, 275. 

 his daughter Katherine Mary D. 



married to J. C. M., 276. 

 Dielectric, Maxwell's theory of action 



in, 559. 

 Dynamical top, Maxwell's paper on, 287, 



500. 

 Dynamics, Maxwell's investigations in, 



465, 498-501. 

 letters to W. Garnett on, 398, 399. 



EDINBURGH ACADEMY chosen as the 

 school for J. C. M., 44. 



early days at, 45-61. 



rector's class under Archdeacon 

 Williams, 66. 



