2 GLACIAL GRAVELS OF MAINE. 



easy to theorize regarding the probable behavior of such a body of ice, 

 and, if properly held in check, imagination is of the greatest use in such 

 an investigation, but the chances for error are very great. The method 

 here adopted has been to collect as large a body of facts as possible, and 

 then carefully to. test various hypotheses by the facts, rejecting or holding 

 in abeyance all theories not supported by positive field evidence. Glacial- 

 ists are exploring a comparatively untrodden field, and it behooves them 

 to proceed cautiously and to avoid dogmatism and denunciation. 



This report is intended to apply only to Maine, and is not a history of 

 the progress of glacial science. For present purposes, therefore, it is not 

 necessary to refer in detail to the many reports and articles which have 

 been written on the subject of the water-assorted glacial drift of North 

 America. 



Chronological list of works treating of the glaciology of Maine. 



Bailey, J. W. Account of an excursion to Mount Katalidin, in Maine. Am. Jour. 



Sci., 1st series, vol. 32, 1837, pp. 20-34. Drift phenomena, pp. 26, 33-34. 

 Jackson, Charles T. First report on the geology of the State of Maine. Augusta, 

 1837. 8°, 127 pp. 



Second report on the geology of the State of Maine. Augusta, 1838. 8°. 168 pp. 



Third annual report on the geology of the State of Maine. Augusta, 1839. 8^. 

 Pp. 1-276, i-lxiv. 



[Also two reports on the geology of the Wild Lands (1839), largely duplicative 

 of the above worlis.] 



[Bowlders and diluvial scratches in Maine. Discussion.] Am. Jour. Sci., 1st series, 

 vol. 41, 1841, p. 176. 



[Glacial drift.] Am. Jour. Sci., 1st series, vol. 45, 1843, pp. 320-324. Eeference to 

 drift in Maine. 

 Hitchcock, C. H. General report upon the geology of Maine. In sixth annual 

 report of the secretary of the Maine board of agriculture (Augusta, 1861, 8°), 

 I)p. 146-328. Superficial deposits, pp. 257-288. Includes letter from John 

 De Laski concerning effects of glacial action on Vinalhaveu. 



Geology of the Wild Lands. In sixth annual report of the secretary of the 

 Maine board of agriculture (Augusta, 1861, 8°) ; Part II, Physical geography, 

 agricultural capabilities, geology, botany, and zoology of the Wild Lands in 

 the northern part of the State, pp. 331-458. Geology, pp. 377-442, including 

 remarlis on glacial drift. Geological map opposite p. 377. 



Geology of Maine. In seventh annual report of the secretary of the Maine 

 board of agriculture (Augusta, 1862, 8°) ; Part II, ReiJorts upon the geology 

 of Maine, pp. 223-430. Surface geology, pp. 377-401. Glacial phenomena 

 described, pp. 378-391. This report includes a letter from John De Laski on 

 "Ancient glacial action in the southern part of Maine," pp. 382-388. 



