Interpolation, 194.

Invariant, 293, 310, 325, 328, 344, 354.

Inverse probability, 340.

Inverse tangents (problem of), 169, 189, 220, 222, 223.

Involution of points, 60, 177.

Ionic School, 17–19.

Irrationals, 22, 26, 69, 94, 107, 362, 372. See Incommensurables.

Irregular integrals, 344.

Ishak ben Honein, 104.

Isidorus of Seville, 118; ref. to, 61.

Isochronous curve, 234.

Isoperimetrical figures, 51, 237, 249, 261. See Calculus of variations.

Ivory, 285; ref. to, 276.

Ivory's theorem, 285.

Jacobi, 351–352; ref. to, 279, 291, 295, 308, 309, 315, 324, 330, 333, 341, 347, 349, 350, 353, 357, 365, 367, 370, 374, 377, 378, 379, 381.

Jellet, 334; ref. to, 381, 390.

Jerrard, 328.

Jets, 382, 386.

Jevons, 340.

Joachim. See Rhæticus.

Jochmann, 402.

John of Seville, 126, 159.

Johnson, 347.

Jordan, 329; ref. to, 341, 343, 346.

Jordanus Nemorarius, 134.

Joubert, 353.

Joule, 399; ref. to, 401, 403.

Julian calendar, 81.

Jurin, 236.

Kaestner, 363; ref. to, 217.

Kant, 274, 376.

Kauffmann. See Mercator, N.

Keill, 231, 232, 235.

Kelland, 383, 397.

Kelvin, Lord, 395–396; ref. to, 283, 315, 358, 381, 382, 383, 388, 391, 393, 394, 395, 399, 400, 403. See Thomson, W.

Kempe, 326.

Kepler, 168–170; ref. to, 139, 156, 158, 161, 167, 171, 174, 202, 213, 263.

Kepler's laws, 168, 213.

Kerbedz, XIII.

Ketteler, 393.

Killing, 306.

Kinckhuysen, 204.

Kinetic theory of gases, 401–403.

Kirchhoff, 396; ref. to, 309, 381, 382, 383, 388, 393, 396.

Klein, 343; ref. to, XII., 305, 306, 307, 309, 313, 328, 330, 345, 346, 347, 354.

Kleinian groups, 345.

Kleinian functions, 360.

Kohlrausch, 394.

Kohn, 337.

König, 401.

Königsberger, 353; ref. to, 344, 350, 354, 355.

Köpcke, 382.

Korkine, 372; ref. to, 341.

Korndörfer, 313.

Kowalevsky, 380; ref. to, 345, 352, 378.

Krause, 355.

Krazer, 355.

Kronecker, 329; ref. to, 328, 330, 359, 365.

Krönig, 401.

Kühn, H., 317.

Kuhn, J., 219.

Kummer, 370, 371; ref. to, XIII., 179, 314, 337, 338, 343, 355, 365.

Lacroix, 284, 286, 287, 320.

Laertius, 10.

Lagrange, 260–270; ref. to, 4, 77, 174, 179, 183, 244, 246, 247, 248, 254, 255, 259, 273, 277, 278, 279, 280, 293, 296, 304, 309, 313, 314, 325, 362, 363, 364, 367, 378, 383, 386, 387, 401.

Laguerre, 306.

Lahire, de, 240.

Laisant, 319.

La Louère, 177.

Lamb, 378, 382, 383, 396.

Lambert, 258–259; ref. to, 2, 290, 303, 313.

Lamé, 389; ref. to, 367, 389, 392.

Lamé's functions, 389.

Landen, 259; ref. to, 268, 279.

Laplace, 270–278; ref. to, 174, 215, 245, 246, 256, 263, 279, 285, 320, 336, 340, 362, 363, 373, 375, 376, 384, 386, 392, 395, 398.

Laplace's coefficients, 277.

Latitude, periodic changes in, 392.

Latus rectum, 48.