39 
the coast of the British Isles, and also Carex incurvci (Lightf.), 
which is confined, in England, to the coast of Northumberland, 
and extends along the Scottish coast from Fife to the Shetland 
Isles. 
In studying the distribution of plants there is much to be 
said in favour of the theory that species have originated at, and 
radiated from, definite centres. Changes must have been effected 
in the Flora of Britain since the sea covered the connecting links 
between this country and the continent, which may be ascribed 
to climatic conditions, or to human agency in the introduction 
or extinction of members of the Flora. It may assist us in 
appreciating these changes if we glance through the examples 
of the Cyperaceee in your Herbarium and compare the records 
and specimens relating to the Flora of the British Isles 
(particularly as regards Yorkshire), since 1790. 
In 1790, the ground between York Museum and the river 
Ouse was known as the Manor Shore. It was a waste piece 
of land on which a few native and alien plants contrived to 
exist. On the other side of the river, Hailstone recorded in 
1806 the existence of Carex stricta as occurring “ in the^Ouze 
out of North Street Postern.” 
In 1830, Carex distich a (Huds), C. ovalis (Good), end C.pulicaris 
flourished in the damp low-lying fields between North Street 
Postern and Thief Lane. 
None of these Carices are to be found in these stations 
now. The Manor Shore has been converted into the orna¬ 
mental gardens belonging to this Society, and the space 
between North Street Postern and Thief Lane is now occupied 
by the Station Hotel and extensive system of the North 
Eastern Bailway. 
If we extend our peregrinations we shall find many places 
of especial importance to those who are interested in the 
distribution and preservation of the British Flora. 
/ 64 N.W. Askham Bogs, Dringhouses 
| Brickpond. 
t ji Tr i t'v ’ i * j I 61 S.E. Heslington Fields, Langwith, 
In the York District. I gkipwithi au ° d Eiccall Common. 
62 N.E. Strensall and Towthorpe 
Commons, Suett Carr. 
In the Malton District. 62 N.E. Terrington Carr. 
