64 THE ESSEX NATURALIST. Biology observes that, in all three cases, the treatment on which this sub-division is based is the same in kind and only differs in degree; the purpose all through is to enable Man to behave as lord of Creation: the give, wherever contact with Human Society occurs, must be an obligation on the animal or plant concerned; the take must be the prerogative of Man. But there is further evidence that, even where Man establishes "symbiosis" with any animal or plant, the association is not a balanced one: Human Society does not exhibit the har- monious internal adjustment or the attractive external appear- ance of any natural symbiosis in which Man is not a partner. What may occur in such a symbiosis, even when the sequence of meiosis and syngamy in the reproductive cycles of the partners is reversed, can be traced with ease, especially if vegetative conditions permit them to create a tertium quid with distinctive characters and qualities. It is not always easy to follow what occurs in some of the symbioses that go to constitute Human Society, which is conditioned not only by the calculable variables of space and time and climate, but also by the incalculable ones of Man's emotions and will. Whatever conclusion Human Society may eventually reach as to the validity of Man's claim to be lord of Creation, Biology will probably continue to think Man the most interesting member of that symbiotic organisation. But whether Man be the most important partner in the symbiosis, Biology is hardly able to say. Apparently Human Society at present is disposed to admit Man's claim, less on any evidence offered by Biology than because Physical Science thinks Man has succeeded in reducing space and time to a simple continuum. Human Society knows that Physical Science has enabled Man to exchange speech with the Antipodes; to travel by road or rail or air as easily and almost as quickly as if he owned the magic carpet of Persian fable; to build palaces almost as expeditiously as if he possessed Aladdin's wonderful lamp. But Biology observes that Human Society, aware of Man's foible for using speech to conceal thought, asks for simultaneous television; notices that Human Society's craze for speed remains unsatisfied With an annual holocaust, on our roads alone, comparable with the casualty-list of a Victorian military campaign; and recognises that Human Society's enthusiasm for building, though