The Appreciation of Non-Euclidean Geometry: <i>Histoire des Mathématiques</i> . Par Jacques Boyer. Paris, Carré et Naud. 1900. 8vo. Pp. xi + 260. Price, 5 francs; <i>Geometry: Ancient and Modern</i> . By Professor Edwin S. Crawley. <i>Popular Science Monthly</i> (January). 1901. Pp. 257-266; <i>Non-Euclidean Geometry</i> . By Professor Henry Parker Manning. Boston, Gina and Company. 1901. 8vo. Pp. vi + 95.
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