ASSISTANTS IN 1881. 



John F. Carll, geologist for the Oil regions ; address Pleasantville, Venango 

 county, Pa. 



J. Sutton Wall, to report on the coal and collieries of the Monongahela re- 

 gion ; address Monongahela city, Pa. 



J. J. Stevenson, geologist for Bedford and Fulton counties ; address Union- 

 town, Fayette county, Pa. 



W. G. Platt, geologist for Centre and Clearfield counties ; address 907 Wal- 

 nut street, Philadelphia. 



R. H. Sanders, geologist for the roofing slate belt in Berks, Lehigh and 

 Northampton ; address 907 Walnut street, Philadelphia. 



I. C. White, geologist for Pike and Monroe ; address Morgantown, W. Va. 



C. A. Ashburner, geologist for the Anthracite coal fields ; address Potts ville. 



H. Martyn Chance, M. D., geologist to report on mining methods and ap- 

 pliances ; address Wilkesbarre. 



A. W. Sheafer, assistant geologist on the Anthracite Survey ; address Potts- 

 ville. 



Frank A. Hill, aid at Lansford. 



Bard Wells, aid at Pottsville. 



H. I. Moyer, draughtsman on Anthracite Survey. 



E. V. d'Invilliers, topographical geologist for the Reading mountains ; ad- 

 dress 907 Walnut street, Philadelphia. 



A. E. Lehman, topographical geologist for the South Mountains ; address 907 



Walnut street, Philadelphia. 

 H. Carvill Lewis, volunteer geologist for the study of the surface deposits, 



moraines, &c; address Germantown, Pennsylvania. 

 Revd. G. F. Wright, associate volunteer geologist for the same. 

 O. B. Harden, draughtsman at headquarters, 907 Walnut street, Philadelphia. 

 A. S. McCreath, Chemist, in charge of the laboratory at 223 Market street, 



Harrisburg. 

 John M. Stinson, assistant chemist at Harrisburg. 



F. A. Genth, Mineralogist and Chemist ; address University of Pennsylvania, 

 West Philadelphia. 



Leo Lesquereux, palceo-botanist ; address Columbus, Ohio. 



F. W. Forman, clerk in charge of the Distribution of Reports, 223 Market 

 street, Harrisburg, Pa., to whom all communications or enquiries respecting 

 publications should be addressed. 



E. R. Harden, topographer, in charge of illustrations, correspondence, etc., at 

 Headquarters, 907 Walnut street, Philadelphia, to whom all business com- 

 munications respecting the Work of the Survey should be addressed. 



