134 Address to the L.N.U. 
tions can be clearly established. In taking a general survey of 
the whole area it appears capable of being irregularly divided 
into at least six fairly marked districts, these are— 
I.—The Marsh and Middle Marsh—which is the whole of the 
great alluvial flat which lies between the east coast and 
the foot of the chalk wolds, as far as Spilsby. » 
I].—The Fens—south of Spilsby and Wainfleet and east of 
Billinghay, Heckington, Bourn, and Market Deeping, 
with a branch extending westward of the Witham to 
Lincoln. 
I1J.—The Chalk Wolds. 
IV.—The Heath—an irregular district, partly on the oolite 
and partly on the lias, and not easily defined. In its 
more southern portion it is split into two arms by the 
Witham valley. It runs from S.E. to N.W., and in- 
cludes the heaths near Woodhall Spa, the moorland near 
Market Rasen and below Caistor, and the commons and 
rabbit-warrens between Gainsboro’ and Frodingham, in 
the north-west of the county. 
V.—A portion of Kesteven, south of Grantham and east of 
Belvoir, of which Corby is about the centre, well-wooded, 
picturesque, and highly cultivated and containing noble 
parks and country seats. 
VI.—The Isle of Axholme, formerly moor, bog and widely 
extending heath and low firwood, but now 50,009 acres 
of rich warp, and bounded to the north-west by the great 
level of Thorne waste in Yorkshire. 
It must be clearly understood, however, that these divisions 
are only approximate, and that with our present knowledge no 
absolutely hard and fast lines can be laid down defining faunal 
areas, and that there are yet portions of the county which it is 
difficult to range under any of these divisions. 1 have en- 
deavoured to define roughly six fairly marked districts within 
the boundaries of Lincolnshire, and:I shall now briefly enter 
more fully into the physical peculiarities of each, and endeavour 
to show that, notwithstanding the great changes which have 
