May 1, 1896.] 



SCIENCE. 



64r 



XXXII. Tlie Olindiadce and other Me- 

 duscB, W. K. Beooks. 



XXXIII. Budding in Pero2Jhora, W. K. 

 Brooks and George Lefeveb. 



XXXIV. Anatomy of Yoklia, W. K. 

 Brooks and Gilman Drew. 



XXXV. On the Pithecanthropus JEreetus 

 from the Tertiary of Java, O. C. Marsh. 



Prof. H. P. Bowditch was elected a 

 member of the council in the place of Prof. 

 G. L. Goodale, who asked to be relieved 

 from the duties of the office. Charles D. 

 Walcott, director of the United States Geo- 

 logical Survey, and R. S. Woodwai'd, Pro- 

 fessor of Mechanics in Columbia Universitj^, 

 were elected members of the Academy. 

 The death was announced of Gen. Thomas 

 L. Casey, U. S. A. There are now eightj-- 

 nine members of the Academy, eighty-three 

 members have died since its foundation in 

 1863. 



During the meeting of the Academy the 

 committee appointed at the request of the 

 Secretary of the Interior to report on a for- 

 estry policy for the government held several 

 sessions. Members of the Academy ap- 

 peared before the Senate committee having 

 charge of the bill to fix the standard of 

 weights and measures by the adoption of 

 the metric system. Profs. Ira Eemsen, 

 John Trowbridge and G. J. Brush were ap- 

 pointed delegates to attend the sesqui-cen- 

 tennial celebration of Princeton Univ. A re- 

 ception was given to members of the acad- 

 emy and invited guests by Mr. and Mrs. Ar- 

 nold Hague on the evening of April 22d. 



The autumn meeting of the Academy for 

 the reading of scientific papers will be held 

 ill New York, beginning November 17th. 



GEOLOGIC ATLAS OF THE UNITED STATES. 

 FOLIO 2, RINGGOLD, GEORGIA-TENNESSEE, 1891. 



This folio consists of 3 pages of text, 

 signed by C. Willard Hayes, geologist ; a 

 topographic sheet (scale 1 : 125,000), a 



sheet of areal geology, one of economic ge-' 

 ology, one of structure sections, and one 

 giving columnar sections. 



Geography. — The district of country cov- 

 ered by this folio lies mainly in Georgia, a 

 narrow strip about a mile in width along 

 its northern border extending into Tennes- 

 see. It embraces portions of Dade, Catoosa, 

 Walker, Whitfield, Chattooga, Floyd and 

 Gordon counties in Georgia, and of Madi- 

 son, Hamilton and James counties in Ten- 

 nessee. The region forms a part of the 

 great Appalachian Valley. Its surface is 

 marked by three distinct types of topog- 

 raphy, viz.: plateaus, formed by hard rocks 

 whose beds are nearly horizontal; sharp 

 ridges, formed by hard rocks whose beds 

 are steeply inclined ; and level or undula- 

 ting valleys, formed on soft or easily eroded 

 rocks. The plateaus are confined to the 

 western third of the district and include 

 portions of Lookout and Sand Mountains. 

 Their surface is generally level or rolling, 

 with a slight inclination from the edges to- 

 ward the center, giving the plateau the 

 form of a shallow trough. They are 

 bounded by steep escarpments rising from 

 1,000 to 1,200 feet above the surrounding 

 valleys. The sharp ridges are confined to 

 the eastern third of the district, while a 

 broad undulating valley occupies its cen- 

 tral portion. The latter is drained in part 

 northward by tributaries of the Tennessee, 

 and in part southward by streams flowing 

 directly to the Gulf. The divide sej^arating 

 the two drainage systems is broad and low, 

 and there is evidence that the Tennessee 

 River formerly flowed southward across the 

 divide. 



Geology. — The rocks appearing at the sur- 

 face within the Ringgold district are en- 

 tirely of sedimentary origin and include 

 representatives of all the Paleozoic groups. 

 The oldest rocks exposed are shales, sand- 

 stones and thin-bedded limestones of lower 

 and middle Cambrian age. These are 



