21 
“ Fourth. — Iho western division (marked W. on the map) which 
comprises all that remains of the county, and contains geological 
leatures of a much more varied kind. Thus the north-e<ist corner 
is occupied by a small portion of the medial chalk, to which 
succeeds a belt of the hard chalk, running from Hunstanton to the 
hanks of the Little Ouse, then follows a narrower belt of the chalk 
marl, succeeded by about the same width of greensand or carstono, 
and the series ends with a very narrow line of Kimmeridge clay 
and Oolite, which runs I'rom Ileacham until it nearly reaches the 
Wissey. Ihe extreme west of the county is occupied by the 
alluvium of IMarshland and of the valleys of the Ouse, the 
Wissey, and the FTar.” 
This is Mr. Munford’s account of his divisions, hut I think the 
main characteristics of them may be sumnied up very shortly. 
I he eastern division contains the whole of the broad country; the 
western the whole of the fen country, and the central divisions 
consist entirely of the high land lying between those two di.stricts. 
I have myself made use of these divisions in keeping my own 
list of the Flora of the county, and am (piite satisfied with them. 
The main objections I expect to find rai.sed against them is that 
they are too few, but I think this is the right side on which to 
err ; and as an example of much greater sub-di\dsion of a county, 
and, if I may venture to say so, of excess of sub-division, I have 
here Professor Babington’s map of Cambridgeshire, in which that 
county, though only two-fifths of the size of Norfolk, is cut up 
into eight divisions, each numbered and named after the principal 
place within it ; in this case we must remember that the division 
is immensely aided by the rivers and drains which intersect the 
county, most of the boiindaries of the districts being formed by 
them. 
There is one other point of method to which I beg to call your 
attention — it is the absolute necessity in all lists of using the 
authority after the specific name. As a proof of this we need go 
no further down the list of plants than the genus Viola, in which 
the species “ canina ” used without authority means, according to 
the third edition of English Botany, at least three different plants, 
viz. : — 
V. canina Z).=Sylvatica Fries, and includes subspcc. Piviniana 
Keich. 
