The Yellow Mask; or, The Ghost in the Ball-Room. By Wilkie Collins. Philadelphia. T. B. Peterson & Brothers. 8vo. paper, pp. 65. 25 cts. Aden Power; or, The Cost of a Scheme. A Novel. By Farleigh Owen. Boston. T.O.H.P. Burnham. 8vo. paper, pp. 155. 50 cts. Cursory Thoughts on some Natural Phenomena. Bearing chiefly on the Primary Cause of the Succession of New Species, and on the Unity of Force. New York. C. Scribner. 8vo. paper, pp. 32. 25 cts. The Trail-Hunter. A Tale of the Far West. By Gustave Aimard. Philadelphia. T.B. Peterson & Brothers. 8vo. paper, pp. 175. 50 cts. The Crisis: its Rationale. By Thomas J. Sizer. Buffalo. Breed, Butler, & Co. 8vo. paper, pp. 100. 25 cts. Footnotes: 1: The original of the leaf copied on the next page was picked from such a pile. 2: _Report on the Sanitary Condition of the British Army_, p. 498. 3: _Report on the Sanitary Condition of the British Army_, p. 499. 4: _Medical Statistics of the United States Army_, 1839-54, p.625. 5: _Report on the Sanitary Condition of the British Army. _6: _Ibid. _7: _Traité de Géographie et de Statistique Médicales_, Tom. II. p. 289. 8: _Ibid_. p. 286. 9: _Traité de Géographie et de Statistique Médicales_, Tom. II. p. 284. 10: _Report on the Sanitary Condition of the British Army_. 11: Medical Statistics U.S. Army, 1839-54, p. 491, etc. 12: Observations on the Diseases of the Army, p. 51. 13: Ib., p. 53. 14: Observations on the Diseases of the Army, p. 59. 15: London Statistical Journal, Vol. XIX. p. 247. 16: Edmonds in _London Lancet_, Vol. XXXVI. p. 143. 17: _Despatches_. 18: Edmonds in _London Lancet_, Vol. XXXVI. p. 145. 19: Edmonds in _London Lancet_, Vol. XXXVI. p. 148. 20: _Ib_., p. 219. 21: Boudin, _Traité de Géographie et de Statistique Médicales_, Tom. II. p. 289, etc., quoted by him from Major Moltka. 22: _Report on the Sanitary Condition of the British Army_, p. 524. 23: _Medical Sketches_, p. 39. 24: _Ib_., p. 204. 25: _Ib_., p. 66. 26: _Medical Sketches_, p. 119. 27: _Ib_., p. 199. 28: _On Epidemics_, p. 70. 29: _United States Documents_, 1814. 30: _Ib_., 1814. 31: _Executive Documents, U.S._, 1847-48, Vol. VII. p. 1013. 32: _Ib_., p. 1033. 33: _Ib_., p. 1185. 34: _MS. Letter of Mr. Elliott_, Actuary of the Sanitary Commission. 35: _Report on the Sanitary Condition of the British Army_, p. 180. 36: Ib., 525. 37: _Medical and Surgical History of the War in the East_, Vol. II. p. 252. 38: _Report on the Sanitary Condition of the British Army_, p. 377. 39: _Medical Sketches_, p. 246. 40: _Medical Sketches_, p. 66. 41: Boudin, _Traité de Géographie et de Statistique Médicales_, Tom. II., p. 289. 42: _Report on the Sanitary Condition of the British Army_, p. 180. 43: _Medical and Surgical History of the British Army in the East_, Vol. II. p. 227. 44: _British and Foreign Medical and Surgical Journal_, Vol. XXI. 45: _MS. Letter of Mr. Elliott. _46: _Medico-Chirurgical Transactions_, Vol. VI. p.478, etc.