410 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



the Solway Firth, the fen-lands of Lincolnshire from Wainfleet to Peter- 

 borough, in Northampton, and at Ely, March, and Croyland. The last 

 district lies further inland than the marsh land, and has been reclaimed 

 by drainage, first taught by the Dutch engineer employed by Charles II. 

 This land produces much straw and heavy potato crops (ten tons to 

 the acre being not uncommon) ; these are known in the market as " black- 

 land" potatos. 



