ORIGIN OF THE DEADNETTLES IN BRITAIN 857 
or absence of special species except such as is afforded by the 
necessarily meagre evidence of geology. Various deposits con- 
taining plant remains, and supposed to date from pre-glacial right 
up to Roman times, have been discovered in England, and Mr. 
Clement Reid has summarized the facts obtainable from these 
new and previously undisturbed land in England is first 
entered by man, and as soon as he has begun to make fields, 
villages, and roads, certain weeds spring up which have never 
grown there before. Among these some of the Deadnettles very 
frequently find a place. 
eeing, then, that man reached England from the Continent, 
and that these weeds grow abundantly there, it is fair to assume 
that they arrived in this country at about the same time as he did, 
and by his means. How they came to be man’s companions in his 
ia, the Caucasus, 
Persia, and the Altai range. Besides this, it occurs about villages, 
roadsides, hedges, and waste places, not only in those regions, bu 
throughout almost the whole of the north temperate zone of the 
le world. A clear distinction can be drawn between its range 
a 
than and enclosing the former. In such districts as south-eastern 
ia ij i d, and Korshinsky, in his 
ve an wee _ Kors 
flora of that region, pointedly divides his localities into two parts. 
woods just as in the south of Europe. We must imagine that 
the species left its native forests when man first prepared the way 
