84 ON THE WORLD-DISTRIBUTION OF BRITISH PLANTS. 
Extracts and Abstracts. 
ON THE WORLD-DISTRIBUTION OF BRITISH PLANTS. 
By Tomas Comser. 
[ Abstract of a Paper printed in the Transactions of the Historie Society 
Lancashire and Cheshire, 1874. | 
As regards their occurrence within Britain, Mr. Watson has pro- 
posed for British plants certain groups, which he terms types of 
distribution ; such as British for those plants which are met with 
those which are found only or mostly in the Northern or Southern 
half of the island; German and Atlantic for those which are co 
chiefly to the Southeastern or South-western provinces. — although 
om the names of the two last it might be inferred that the range 
outside of the United Kingdom j is indicated, Mr. Watson i is careful to 
n on. II 
Containing plants which, while generally ex xtending South to the 
Mediterranean, range over the whole of Europe, except frequently t the 
extreme North; and also some plants of more limited range, which 
extend neither far North nor far South. III. Worthern : Consisting 
of species of Northern and Central Europe, which, although descent- 
level in any part of Britain; and also those which extend farther 
south, but are there ean! Alpine plants. 
‘ Viewed as to their range from East to “West, our Flora falls. like- 
wise into four — divisions, extending as follows :—Division I. 
To Europe only : spreading farther East than the Ural Mountait 
and the Cansei nor extending to any part of Asia. Division ee 
