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23. Observations on tin- .Imirt ion between llir Eastern Sandstone and tin- Keweenaw Serif- mi 

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24. List of Marine Mollnsca, comprising the Quaternary Fossils ami Recent Forms from American 

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1'x. The ( I'ahhros and Associated Hornblende Rocks occurring iu the Neighborhood of Baltimore, 



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I'll, on theFresh-Water Invertebrates of the North American Jurassic, by Charles A. White. ixxt;. 

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:il>. Second Contribution to the Studies on the Cambrian Faunas of North America, liy Charles 

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31. Systematic Review of our Present Knowledge of Fossil Insects, including Myriapods anil 

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32. Lists and Analyses of the .Mineral Springs of the I'uited States; a Preliminary Study, by 

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:;:;. Notes on the Geology of Northern California, by J. S. Diller. issii. 8. L':: pp. Price.") cents. 



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35. Physical Pi opert ies of the' Iron-Carburets, by Carl I'.arus and Vincent Strouhal. ISSIi. s . 

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40. ( 'ha lines in IJh er < 'onrses in Wasliini;toii Territory due to Glaciation, by Ha i ley Willis. ISS7. 

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II. liililionrapliv of North American (.'colony for isxii. by Nelson II. Harton. IXX7. X-. l!5 pp. 

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45. The Present Couditi f Knowledge of the Geology of Texas by K'obert T. 1 [ill. 1XX7. X^. 



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tli. Nat me and ( (rigin of Deposits of Phosphate of Lime, by I.'. A. !'. Pen rose. jr.. \villi an Intro- 

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|x. On the Form and Position of the Sea Level, liy 1,'obert Simpson Woodward. 1XXX. X . XX 

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51. on ln\ ei tebrate Kossils from the Pacific Coast, by Charles Abiathar White. IXXit. x . 10L' 

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51. On the Tlierino-Eleelrie Measurement of l!i-_;h Temperatures, by Carl liarus. IXX'.I. X-. 

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55. K'cport of \\'ork done in (lie >ivisi<ni of Chemistry and 1'bysics, mainly dnrini; the Fiscal 

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5(1. Fossil Wood and Lignite of Hie Pot ac Formation. b\ Frank Hail Kiiowllou. 1XX9. 8. 



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57. V (ieoln^Mal K'eeunnoissa nee in Southwestern Kansas, by Robert Hay. 1X!KI. X . 40 pp. 



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58. The . .lacial lioundary in Western Pennsylvania. Ohio, Kentucky. Indiana, and Illinois, by 

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511. The iabbros mid Associated K'ocks in I <elaware. by I rcdern-k D. Chester. IXilO. X. 45 

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