18 STONE IMPLEMENTS [eih.ann.15 



and on the opposite side of the river Mr O. N. ]}ryan gathered many 

 things of value, both series of objects having found a resting place in 

 the National Museum. Mr John Bury made a valuable collection from 

 the Anacostia village-sites, which was acquired recently by the Bureau 

 of Ethnology. 



lialtimorc has contributed her share to tlie work of preserving his- 

 toric materials througli lier well-kiiown citizen Colonel W. II. Love, 

 whose large collections of specimens and extensive knowledge of sites 

 Lave been of much service in the preparation of the present memoir. 

 Among the many others who have taken an active ])art in the work of 

 collecting are Mr J. C Lang, of Washington, Mr C. M. Wallace, of 

 Richmond, Mr M. II. Valentine, of Richmond, Mr II. M. Murray, of 

 West River, Maryland, and Rrof. Thomas Wilson, of Washington. 



There are still others to whom acknowledgments must be made. 

 To Mr Frank Hamilton Gushing, who a few years ago made a careful 

 study of the Amelia county,. Virginia, soapstone quarry; to Mr F. W. 

 Von Dachenhausen, whose collections from the vicinity of Washington 

 have been drawn upon for illustration, and to Mr De Lancey W. Gill, 

 of the Geological Survey, who has been closely associated with me in 

 the work of collecting and elaborating, I am greatly indebted. 



1 wish especially to acknowledge the assistance given by Mr William 

 Diuwiddie, who has been almost constantly associated with me in field 

 work and in the office, and who was intrusted with much of the labori 

 ous task of quarry excavation; by Mr Gerard Fowke, who conducted 

 the exploration of the Piedmont regions of Virginia and Maryland; 

 and by Major J. W. Powell aiul Mr W J M(;Gee, to whom I am greatly 

 indebted for encouragement, sympathy, and support at all times and in 

 all places. 



The artists whose work adds so much to the effectiveness and scien- 

 tific value of this publication are Miss Mary M. Mitchell, Mr H. C. 

 Hunter, and Miss Frances Weser. The landscape photographs are 

 largely the work of Mr Diuwiddie, and the series of plates of flaked 

 stones are from the studio of Mr T. W. Smillie, of the National Museum. 



