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Spectrum analysis in its application to terrestrial substances and the physical constitution of the heavenly bodies; translated from the 2d German ed. by Jane and Caroline Lassell, edited by W. Huggins. London, 1872. 8°. pp. xxvi., 662. Plates and wdcts. Die 5. Velocity of Light. Kuckuck, A. Die Geschwindigkeit des Lichtes. Berlin, 1867. 4o. pp. 35. Lovering, J. On the velocity of light and the sun's distance. [New Haven, ] 1863. 80. pp. 12. "From the American journal of science, &c., vol. xxxvi., Sept. 1863." Michelson, A. A. Experimental determination of the velocity of light, made at the U. S. naval acad., Annapolis. Washington, 1880. 4o. PP. 109-145. (Astron. papers Amer. Ephemeris, vol. i., pt. 3.) 6. Wave Theory. Airy, G. B. On the undulatory theory of optics. New ed. London, etc., 1866. sm. 80. pp. viii., 159. Plates. Briot, C. Essais sur la théorie mathématique de la lumière. Paris, 1864. 8o. pp. xxii., 132. Cauchy, L. Mémoire sur la dispersion de la lumière. 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(2), pp. 35+, 306. Plates. Chase, P. E. Remarks on the mathematical probability of accidental linguistic resemblances, and on the comparative etymology of the Yoruba language; with a mathematical. note by J. E. Oliver. [Philadelphia, 1869.] 4°. Pp. (25)-72. "From the Transactions of the Amer. philos. society, vol. Condorcet, M. J. A. N. de C., marquis de. Élémens du calcul des probabilités, et son application aux jeux de hasard, à la loterie, et aux jugemens des hommes; avec un Discours sur les avantages des mathématiques sociales, et une notice sur Condorcet. Paris, An. XIII. (1805). sm. 8°. pp. (iii.)–xii., 210. Cournot, A. A. Exposition de la théorie des chances et des probabilités. Paris, 1843. 80. pp. viii., 448. Plate. De Morgan, A. An essay on probabilities and on their application to life contingencies and insurance offices. London, 1838. 120. pp. xviii., 306, xl. Fries, J. F. Versuch einer Kritik der Principien der Wahrscheinlichkeitsrechnung. Braunschweig, 1842. 8o. pp. vi., f. (1), pp. 236. Traité élémentaire de calcul des Paris, 1864. 8o. pp. xi., Lacroix, S. F. probabilités. 4o éd. 308. Plate. [Laplace, P. S., marquis de.] Quatrième supplément à la théorie analytique du probabilités. Paris, 1825.] 4o. f. (1), pp. 28. Bd. with the 1808 ed. of Lagrange's "Equations numériques." [Lubbock, J. W., and J. E. D. Bethune]. On probability. London, 1830. 80. pp. 64. (Society for the diffusion of useful knowledge, Library of useful knowledge, no. 78, 79.) Michaelis, G. Mémoire sur la probabilité du jeu de rencontre. Berlin, 1846. 4°. pp. 31-36. 4o. Moivre, A. de. The doctrine of chances; or, A method of calculating the probabilities of events in play. London, 1738. 4o. ff. (2), pp. xiv., 256. [Montmort, P. R. de.] Essay [sic] d'analyse sur les jeux de hazard. 2o éd. Paris, 1713. 4o. pp. xlii., 414, f. (1). Plates. Quetelet, (L.) A. (J.). 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