18 PREFACE 



Mr. von Herrmaim is Section Director in Baltimore of the U. S. Weather 

 Bureau and is aJso Meteorologist of the Maryland State Weather 

 Service. 



llie Hydrography of Calvert County, by N. C. Grover, gives a brief 

 account of the water supply of the county which, as in the case of the 

 other Coastal Plain counties, affords but little power for commercial pur- 

 poses. The author of this chapter is a member of the Hydrographic Di- 

 vision of the U. S. Geological Survey. 



The Magnetic Declination in Calvert County, by L. A. Bauer, con- 

 tains much important information for .the local surveyors of the county. 

 Dr. Bauer has been in charge of the magnetic investigations since the 

 organization of the Survey and has already published two important 

 general reports upon this subject. He is the Director of the Depart- 

 ment of International Eesearch in Terrestrial Magnetism of the Car- 

 negie Institution. 



The Forests of Calvert County, by H. M. Curran, is an important con- 

 tribution and should prove of value in the further development of the 

 forestry interests of the county. Mr. Curran is a member of the U. S. 

 Forest Service. 



The State Geological Survey desires to extend its thanks to the several 

 National organizations which have liberally aided it in the preparation 

 of several of the papers contained in this volume. The Director of tlie 

 U. S. Geological Survey, the Chief of the U. S. Weather Bureau, the 

 Chief of the U. S. Forest Service and the Chief of the Bureau of Soils 

 of the U. S. Department of Agriculture have granted many facilities for 

 the conduct of the several investigations and the value of the report has 

 iDcen much enhanced thereby. 



