MARYLAND GEOLOGICAL SURVEY 21 



especially on Octoraro Creek, and gives an account of the monthly 

 and daily flow of the Susquehanna, as measured at Harrisburg, Penn- 

 sylvania, since 1890. 



The Magnetic Declination in Cecil County, by L. A. Bauer, Chief 

 of the Division of Terrestrial Magnetism of the U. S. Coast and 

 Geodetic Survey, contains much important information for the local 

 surveyors who are required to re-run old property lines laid out by 

 compass. Dr. Bauer has been engaged for several years in a study of 

 the magnetic conditions in Maryland. 



The Forests of Cecil County, by H. M. Curran, with an introduc- 

 tion by Geo. B. Sudworth, is a valuable and suggestive contribution 

 to the forestry interests of Cecil county. In this report Mr. Curran 

 brings out many items of interest regarding the timber of the county, 

 the depleted condition of the forests and the manner in which these 

 may be improved. This work has been conducted by the Forestry 

 Division of the II. S. Department of Agriculture in cooperation with 

 the Maryland Geological Survey, as indicated in Mr. Sudworth's 

 introduction. 



The State Geological Survey desires to extend its thanks to the 

 several National organizations which have liberally aided it in the 

 preparation of many of the papers contained in this volume. The 

 Director of the U. S. Geological Survey, the Superintendent of the 

 U. S. Coast and Geodetic Survey, the Chief of the U. S. Weather 

 Bureau, and the Chiefs of the Soil and Forestry Surveys of the 

 Department of Agriculture ha^e granted every facility in the conduct 

 of the several investigations. The value of the report has been much 

 enhanced thereby. 



The illustrations contained in the volume have been obtained from 

 various sources. Many of the photographs were taken by the authors 

 of the several papers while in the field. Several of the views were 

 taken by Dr. Edward B. Mathews and Messrs. A. Bibbins and A. 

 Johannsen. 



