After an infinite amount of pains, seeing and writing to all those among my acquaintances who have any knowledge of our wild plant life, I discovered that the mimulus grows more or less abundantly in or by streams here and there in most English counties, but is more commonly met with south of Derbyshire; also that it extends to Scotland, {288} and is known even in the Orkneys. Finally, a botanical friend discovered for me that as long ago as 1846 there had been a great discussion, in which a number of persons took part, on this very subject of the date of the naturalisation in Britain of the mimulus, in Edward Newman's botanical magazine, the _Phytologist_. It was shown conclusively by a correspondent that the plant had established itself at one point as far back as the year 1815. [Sidenote: A British species?] There may exist more literature on the subject if one knew where to look for it; but we are certainly justified in feeling annoyed at the silence of the makers of books on British wild flowers, and the compilers of local lists and floras. And what, we should like to ask of our masters, is a British wild flower? Does not the same rule apply to plants as to animals--namely, that when a species, whether "introduced" or imported by chance or by human agency, has thoroughly established itself on our soil, and proved itself able to maintain its existence in a state of nature, it becomes, and is, a British species? If this rule had not been followed by zoologists, even our beloved little rabbit would not be a native, to say nothing of our familiar brown rat and our black-beetle: and the pheasant, and red-legged partridge, and capercailzie, and the fallow-deer, and a frog, and a snail, and goodness knows how many other British species, introduced into this country by civilised man, some in recent times. And, going farther back in time, it may be said that every species has at some time been brought, or has brought itself, from {289} otherwhere--every animal from the red deer and the white cattle, to the smallest, most elusive microbe not yet discovered; and every plant from the microscopical fungus to the British oak and the yew. The main thing is to have a rule in such a matter, a simple, sensible rule, like that of the zoologist, or some other; and what we should like to know from the botanists is--Have they got a rule, and, if so, what is it? There are many who would be glad of an answer to this question: judging from the sale of books on British wild flowers during the last few years, there must be several millions of persons in this country who take an interest in the subject. [Sidenote: A visit to Swarraton]