34 PROCEEDINGS OF THE PHILADELPHIA MEETING 



1878. The sixth annual report of the Geological and Natural History Survey 



of Minnesota for 1877. 226 pp. Svo. Minneapolis, 1878. This report 

 contains : 



The water supply of the Red River Valley, pp. 9-42. 

 Reconnaissances (in Wright, Goodhue, and Rice counties and 



along Northern Pacific Railroad), pp. 43-49. 

 The geology of Morrison County, pp. 50-5.3. 

 The geology of Ramsey County, pp. 66-92, with a map. 

 The geology of Rock and I'ipestone counties, pp. 93-111, with a 

 map. 

 The recession of the Falls of .St. Anthony. Quart. Jour. Geol. Soc. Lon- 

 don, vol. xxxiv, pp. SS6-901. Nov., 1878. 



1879. The seventh annual report of the Geological and Natural History Survey 



of Minnesota for 1878. 123 pp. 8vo. ^Minneapolis, 1879. This re- 

 poi't contains : 



Sketch of the work of the season of 1878 (a preliminary report 

 on the stratigraphy and mineral resources of the northern part 

 of the State), pp. 9-25. 

 Section of a deep well at Emmetsburg, Iowa. Bull. Minn. Acad. Sci., 



vol. 1, pp. 387-388. 1879. 

 Minnesota (geological formations). Macfarlane's Am. Geol. R. R. 

 Guide, pp. 145-147. 1879. 



1880. The eighth annual report of the Geological and Natural History Survey 



of Minnesota for 1879. 183 pp. 8vo. St. Paul, 1880. This report 

 contains : 



Lithology (microscopic examination of rocks), pp. 10-22. 

 The Cupriferous series at Duluth, pp. 22-26. 

 Paleontology (Lingula, Crania, Orthis), pp. 60-69. 

 Castoroidcs ohioensis, pp. 181-183. 

 Annual address of the President of the Minnesota Academy of Science. 



Bull. Minn. Acad. Sci., vol. i, pp. 389-401. 1880. 

 The Cupriferous series in Minnesota. Proc. Am. Assoc. Adv. Sci., vol. 



xxix, pp. 422-425. 1880. 

 Preliminary report on the building stones, clays, limes, cements, roofing, 

 flagging, and paving stones of Minnesota. Geol. and Nat. Hist. Surv. 

 Minn. 37 pp. 8vo. 1880. 

 The ancient copper mines of Isle Royale (abstract). Bull. Minn. Acad. 

 Sci., vol. i, p. 29. 1880. Printed in full in Popular Science Monthly, 

 vol. xix, pp. 601-620. 1881. 



1881. The ninth annual report of the Geological and Natural History Survey 



of Minnesota for ISSO. 403 pp. 8vo. St. Paul, 1881. This report 

 contains : 



Preliminary list of rocks (field descriptions and notes on 442 

 crystalline rocks fi-om northern Minnesota), pp. 10-114. 



Paleontology (Orthis and Strophomena) , pp. 115-122. 



The water supply of the Red River Valley, pp. 156-174. 



The Cupriferous series in Minnesota, pp. 385-387. 

 Ball's observations on arctic ice, and the bearing of the facts on the 

 glacial phenomena of Minnesota. Am. Jour. Sci., 3d ser., vol. xxi, pp. 

 358-360. 1881. 



