448 BULLETIN lOy, UNITED STATES NATIONAL MUSEUM. 



a section along the Lehigh Eiver finished; and a study made of tb 

 collection of invertebrate fossils. 



Several large maps of the eastern and western counties were pub 

 lished this 5'ear, and a considerable number of new mine sheets, cross 

 section, and columnar sheets of the anthracite field. 



PuhUcations. — The publications of the survey have been as follows, 

 all in octavo : 



1875, six volumes, B, D, H, I, J, M; 1876, four volumes, A, C, 

 K, L, and a pamphlet B'; 1877, five volumes, C^ ff, H", T, IC; 

 1878, nine volumes, D\ E, F, G, H\ K\ N, O, Q: 1879, three volumes, 

 li\ Q^ V; 1880, 12 volumes, C, G% G\ G\ 11% T, 0^ Pi, ii, F, Q,\ 

 R, V*; 1881, six volumes, A^ G', ff, M', Q\ T: 1882, three volumes, 

 C*, G', T', and atlas (AA)1; 1883, seven volumes, AA, AC, C\ D' 

 (1), D^' (2i), G', r, and atlas D'; 1884, six volumes, H', I^, Piii, F, 

 r, Z, and atlas (AA)2; 1885, six volumes, AA^i, C, F^ R\ T% X, 

 and atlases (A A) 3 (Axl)4. In 11 years the survey has published 

 67 volumes, octavo and one jsamphlet, 4 anthracite atlases, and nine 

 other atlases to volumes AC, C, D\ D', I^ P, R, R^ and T. 



It has published colored geological maps of 57 out of the 67 

 counties; colored maps of Cambria, Somerset, Juniata, Mifflin, 

 Snyder, Union, Schuylkill, Berlcs, Montgomery, and Bucks being 

 still unpublished; but uncolored geological maps of Cambria and 

 Somerset are included in their volumes; and colored maps of the 

 eastern half of Berks and of the southern parts of Montgomery 

 and Bucks have been published in advance. All the county maps 

 are on the scale of two miles to the inch except McKean County and 

 Philadelphia, which are on a scale of one and one-half miles to the 

 inch. Colored geological maps of all the counties, on a scale of six 

 miles to the inch, prepared by the State geologist at various stages 

 of the survey, will be found in the hand atlas (X) published in 

 1885. 



AH the volumes of reports, with three or four exceptions, are 

 illustrated with diagrams, sections (columnar and horizontal), 

 sketches made in the field, local maps, and photographic views of 

 such important outcrops as could not otherwise be described with 

 requisite accuracy, amounting in all to several thousand. 



There was published in 1886 one volume octavo and an atlas; the 

 annual report for 1885; the first of its kind, including all the re- 

 ports of assistants presented for that year. A similar annual report 

 for 1886, went to press in time for distribution early in 1887. 



The distributions of the publications of the survey by the board 

 of commissioners was regulated for 10 years — that is, from 1875 

 to 1885— by section 10 of the act of May 14, 1874, which ordered that 

 copies should be donated to all public libraries, universities, and 



