II ADVERTISEMENT. 



1-653 pp., 10.") pi. and majis; i-v, 1-861 pp., 118 pi. nnd maps; i-x. l-T.'il! pp.. 102 ]>1. .iiid maps: i-xii, 

 1-642 pp., 1 pi. ; 613-1400 pp. 



XIX. Ninct'-euth Annual Repurt of the United .States (jeological Survey, lSJI7-'98, Charles D. 

 Walcott, Directiir. IS1I8. (I'arts II, III, and V, ISiC.I. ) 8. 6pt. inTvol. 422 pp., 2 maps; v, 958 

 pp., 172 ]il. and maps; v, 785 pp., 90 pi. and maps: viii, 814 pp., 118 pi. and maps; xvii, 400 pp., 110 

 pi. and ma]is; viii, 651 pp,, 11 1>1. ; viii, 706 pp. 



.\X. Twentieth Annual Report of the I'nited States Geolofjiral Survey, 1898-99, Charles D. 

 Walcott, Diieitor. 1899. (Paris II, III, IV, V, and Vll, 1900.) 8. 7 pt. in 8 vol. .".51 pp., 2 maps; 

 V, 953 pp., 193 pi. anil maps; v, 595 pp., 78 jil. and maps; vii, 660 pp., 75 pi. and maps; xis, 498 pp., 

 159 pi. and maps: viii, 616 pp.; xi, 804 pp., Ipl.; v, 509 pp., 38 pi. and maps. 



MONOGRAPHS. 



I. Lake Bonneville, by (irove Karl Gilbert. 1890. 4-. xx, 438 pp. 51 pi. 1 map. Price$1.50. 



II. Tertiary llistorvot'the Grand Canon District, with Atlas, by Clarence E. Dutton, Capt., U. S. A. 

 1882. 4^'. xiv. 264 pp. 42 pi. and atlas ol 24 sheets iblio. Price .$10.00. 



III. Geolog.v of the Ci>mstoek Lode and the Washoe District, with Atlas, bv George F. Becker. 

 1882. 4°. XV. 422 pp. 7 jd. and atlas of 21 sheets iblio. Price $11.00. 



IV. Comstock Mining and Miners, by Eliot Lord. 1883. 4^. xiv, 451 pp. 3 pi. Price $1.50. 



V. The Copper-Bearing Kocks of Lake Superior, by Ridand Duer Irving. 1883. 4°. xvi, 464 

 pp. l.'^l. 29 pi. and maps. Price $1,85. 



\'I. Contributions to the Knowledge of the Older Mesozoic Flora of Virginia, by William Morris 

 Fontaine. 1883. 4'-. xi, 141pp. 54 1.' .54 pi. Price $1.05. 



VII. Silver-Lead Deposits of Eureka, Nevada, by .Joseph Storv Curtis. 1884. i". xiii. 200 pp. 

 16 pi. Price $1.20. 



VIII. Paleontidogv of the Eureka District, by Charles Doolittle Walcott. 1884. 4^. xiii, 298 

 pp. 24 1. 24 pi. Price' $1.10. 



IX. Iir.icliiii]ioda ami Lamellibrauchiata of the Raritan Clays and Grecnsand JIarls of New 

 Jersey, by l.'ol.ert P. Whitlicld. 1885. 4'-. xx, 338 ])p. 35 pi. 1 maii. Price $1.15. 



'X. Dinocerata. A Monograiili of an Extinct Order of Gigantic Mannnals, by Othniel Charles 

 Marsh. 1886. 4-. xviii, 243 pp. 56 1. 56 pi. Price .$2.70. 



XL Geological History of Lake Lahontan, a Quaternary Lake of Northwestern Neva<la, by 

 Israel Cook Russ(dl. 1885. 'l'-. xiv. 288 pp. 46 pi. and maps.' Price $1.75. 



XII. (ieology and Mining Industry of Lcaclville, Colorado, with Atlas, by .Samuel Fr:inkliu 

 Emnnins. 1886. 4. xxix, 770 pp. 45 pi. and atlas of 35 sheets folio. Price .$8.40. 



XIII. Geologv of the Ouicksilver 1 )eposits of tlu'. Pacihc Slo]ie, with Atlas, by George F. Becker. 

 1888. 4-. xix, 486 pp. 7 ]il. and atlas of 14 sheets f(dio. Price $2.00. 



XIV. Fo.ssil Fishes and Fossil Plants of the Triassic Rocks of New .Jersey and the Connecticut 

 Valley, by .lohu S. Newberry. 1888. 4-'. xiv, 152 pp. 26 jil. Price $1.00. 



XV". Thi' Potomac or Younger Mesozoic Flora, by William Morris Fontaine. 1889, V\ xiv, 

 377 pp. 180 pi. 'I'ext and iilat<-s lioiind separately. Price $2. .50. 



XVI. The I'aleozoic Fishes of North America, by .lolin Strong Newberry. 1889. 4^. 340 pp. 

 53 pi. Price $1.00. 



XVII. The Flora (d' the Dakota (iroup, a Posthumons Work, by Leo Lesqnereux. Edited by 

 F. II. Kuowllon. 1891. 4-. 400 ]ip. 66 jil. Price $1.10. 



XVIII. Gastero])oda andCephalojioda of the Raritan Clays and (ireensand Marls of New .Jersey, 

 by Robert P. Whitlield. 1891. 4-, 402 p]!. 50 pi. Price $1.00. 



XIX. The Penokee Iron-Bearing Series of Northern Wisciuisin and Michigan, by Rohnnl D. 

 Irving and C. R. Van Hisc. 1892. 4-. xix, 531 pp. Price $1.70. 



"XX. Geology of the EnrekaDistrict, Nevada, with an Atlas, by Arnold ll,-ign(\ 1892. 4". xvii, 

 419 pp. 8 pi. Price $5.25. 



XXI. The Tertiarv Rhyuchophorous Coleoptera of the United .States, by Samuel Hubbard Scud- 

 di-r. 1893. 4^. xi. 206 pp.' 12 pi. Price 90 cents. 



XXII. A Manual of Topographic Methods, bv Henry Gannett, Chief Topographer. 1893. 4". 

 xiv. 300 pp. 18 1,1, Price $1.00.' 



XXIII. Geology of thetireen Mountains in Ma-ssachusetts, by Raphael Pnnipelly, T. Nelson Dale, 

 and J. E. Woltt'. 1894. 4^. xiv, 206 pp. 23 pi. Price $1.30. 



XXIV. Mollusca and Crustacea of the Miocene Formations of New Jersey, by Robert Parr Whit- 

 field. 1894. 4^-. 193 pp. 24 1)1. Price 90 cents. 



XXV. The(ilacial Lake Agassiz, by Warren Upham. 1895. 4 . xxiv,658pp. 38pl. Price$1.70. 



XXVI. Flora of the Ambov Clav.s, by John Strong Newberry; a P.sthumous Work, edited by 

 Arthur Hollick. I.'^95. 4^. 260 pp. 58 pi. Price $1.00. 



XX\TI. (ieolo<;y of the Denver Basin in Colorado, liy Samuel Franklin Emmons, Whitman Cross, 

 and George HomansEldridge. 1896, 4^. 556 pp. 31 pi." Price $1.. 50. 



XXMIL The Mar(iuette Iron-Bearing District of Michigan, with Atlas, by C. R. Van Hise and 

 W. S. Bayley, including a Chapter on the Republic Trough, by 11. L. Smyth. 1895. 4 . 608 jiii. 35 

 pi. and atlas of 39 sheets folio. Price $5.75. 



XXIX. (Tcologyof Old Hampshire County, Massachusetts, comprising Franklin, Hampshire, and 

 Hampden Counties, i)v Benjamin Kendall Emerson. 1898. 4°. xxi, 790 pp. 35 i)l. Price $1.90. 



XXX. Fossil Medn.sa-', by Charles Doolittle Walcott. 1898. 4-. ix, 201pp. 47 pi. Price $1..50. 



XXXI. Geology of the Aspen Mining District, Colorado, with .\tlas, by Josiah Edward S])urr. 

 l.><98. 4^. XXXV, 260 pp. 43 pi. and atlas of 30 sheets folio. Price $3.60. 



