ACKNOWLEDGMENTS 



We are indebted for the following permissions : 



For Figs. I, 2, 3, 8, 23, 24, 25, 26, 34, 35, 37, 39, 49 and 52 to the 

 Controller of H.M. Stationery Office and the Director General of the 

 Ordnance Survey. 



For Figs. 4, 29 and 38 and portions of Figs. 18, 19, 20, 21, 47, 48 and 56 

 to the Controller of H.M. Stationery Office and the Director of the 

 Geological Survey. 



For Figs. 54 and 55 (reproduced from British Admiralty Charts, nos. 

 1 177 and 108) to the Controller of H.M. Stationery Office and the 

 Hydrographer of the Navy. 



For the information on Figs. 33 and 36 to the Ministry of Agrictdture 

 and Fisheries. 



For Fig. 7 to Major Gordon Fowler and the Editor of the Geographical 

 Journal. 



For Fig. 16 to the Editor o( the Journal of Ecology. 



For Figs. 17 and 22 to the Editor of the Proceedings of the Cambridge 

 Antiquarian Society. 



For access to the information on Figs. 30 and 31 to the Editor of the 

 Victoria County Histories. 



For Fig. 32 to Mr J. H. Wardley 



For Fig. 40 to Dr J. A. Venn 



For Fig. 46 to Mr W. P. Spalding. 



For Figs. 50 and 51 to the Chief Engineer of the River Great Ouse 

 Catchment Board. 



For Fig. 57 to the Land Utilisation Survey. 



For Fig 58 to the Editor o£ Economic History. 



H. C. D. 



