858 THE JOURNAL OF BOTANY 
for it, and then spread gradually with him, eventually arriving in 
Great Britain. Here, therefore, it would seem to be an introduced 
plant, far from its native country, but it has gained a footing which 
it will doubtless maintain, unless, for any reason, man and his 
operations should cease. 
This explanation of the introduction of Lamium album seems 
but there is another possible one that has been advanced in the 
of some other weeds whic 
have doubtless always been localities which have been kept dis- 
turbed by wild animals, Kurope, before man’s arrival, was certainly 
into the wilder regions by man has been argued 
that, prior to human occupation, these disturbed spots may have 
harboured the same weeds as have since attached themselves to 
the neighbourhood of human habitations. If the weed in question 
a reached England in this way, it would be a native—i.e. it 
wo 
fo) 
plentiful that this weed is most scarce. We are justified, then, in 
falling back on our first hypothesis of its introduction by man. 
The question of the status of the White Deadnettle is not quite 
: , but, if anyone doubts its 
ependence upon man, let him only note in his mind the exact 
ing, or, still better, let him take a 
