PREFACE. XXiii 



it, but in the real coal formation, which lies under, that the 

 coal is found. We do not say, therefore, that coal is not to be 

 found in Berwickshire, as long as we know that it rests to. 

 wards the south on the coal formation of Northumberland ; 

 but the facts now mentioned, should convince those interested 

 in its discovery, that it is in vain to look for it in any part of 

 that formation which covers the low part of Berwickshire 

 that this formation must previously be completely dug through 

 that then it must be ascertained whether the next rock be, or 

 be not, an undoubted member of the coal formation; and 

 that until all this be done, the occurrence of coal in Berwick- 

 shire must be considered, as of all uncertain things, the most 

 uncertain, and the most problematical." 



The Nomenclature which I have adopted, unless when the 

 contrary is specified, is the same as that of the 6 English 

 Flora" of Sir J. E. SMITH, a work which stands unrivalled 

 in this country for the purity and accuracy of its descriptions, 

 and for the interest of its botanical discussions. The Arrange- 

 ment of British Plants by Dr WITHERING, the Flora Scotica of 

 LIGHTFOOT and! of Professor HOOKER, the Flora Lapponica, 

 the Flora Edinensis of Dr GREVILLE, the Botanist's Guide 

 through Northumberland and Durham* and the Catalogue of 

 Plants growing in the vicinity of Berwick by Mr THOMPSON, 

 have been regularly consulted, and whatever information they 

 contained suitable to my purpose, has been borrowed without 

 reserve. A considerable number of extracts has been made 



