If the weather can affect one’s statements of fact, and one’s emotions can affect the apparent course of meteorological events, where is the line to be drawn? What is real? The only things of which we have immediate cognizance are, of course, happenings in our minds: and the precise nature and quality of each of these happenings depends on two things—on the constitution and state of our mind and its train on the one hand; on the other hand upon events or relations between events outside that system. That sounds very grand; but all it means after all is that you need a cause to produce an effect, a machine to register as well as a something to be registered.

As further consequence, since this particular machine (if I may be permitted to use the odious word in a purely metaphorical sense), this mind of ours, is never the same for two succeeding instants, but continually varies both in the quantity of its activity and the quality of its state, it follows that variations in mental happenings depend very largely on variations in the machine that registers, not by any means solely upon variations in what is to be registered.

Few (at least among Englishmen) would dispute the thesis that food, properly cooked and served, and of course adapted to the hour, is attractive four times in the day. But to a large proportion among us, even sausages and marmalade at nine, or roast beef and potatoes on a Sabbath noon, would prove not only not attractive but positively repellent if offered us on a small steamer on a rough day. I will not labour the point.

We all know how the size of sums of money appears to vary in a remarkable way according as they are being paid in or paid out. We all know to our cost the extraordinary superiority of the epochs when our more elderly relatives were youthful. The fact remains that we are always prone to regard the registering machine as a constant, and to believe that all the variation comes from outside. It is easy to discount the inner variation in ourselves when we are seasick, or in others when they are old and reminiscent, but not only is this discounting sometimes far more difficult, it is sometimes not even attempted.

What, for instance, are we to say to those who profess to find a harmony in the universe, those to whom poverty and discomfort and hard work appear the merest accidents, to whom even disease, pain, loss, death, and disaster are “somehow good”? You and I would probably retort that we have a rooted dislike to discomfort, that we should most strongly deny that the loss of a friend or even of a leg was anything but bad, that a toothache was not damnably unpleasant. But I think that if they were philosophically inclined (which they probably would not be), they might justifiably retort that the difference between their universe and ours was due to a difference in their mental machinery, which they had succeeded in adjusting so that it registered in a different and a better way.

It is at least clear that something of the sort can happen in the intellectual sphere. To the uneducated, the totality of things, if ever reflected upon, is a compound of fog and chaos: advance is painfully slow, and interlarded with unpleasant falls into pits and holes of illogicality and inconsequence; to those who have taken the trouble to push on, however, an orderly system at last reveals itself.

The problem of the origin and relationship of species gave such mental distress to those zoologists of the first half of the nineteenth century who were conscientious enough to struggle with it, that many of them ended by a mental suppression of the problem and a refusal to discuss it further. The publication of Darwin’s Origin of Species was to them what psycho-analysis is (or may be) to a patient with a repressed complex. Or again, no one can read accounts of the physicists’ recent work on the structure of the atom without experiencing an extraordinary feeling of satisfaction. Instead of wallowing in unrelated facts, we fly on wings of principle; not only can we better cut our way through the jungle of things, but we are allowed a privilege that has universally been considered one of the attributes of Gods—the calm and untroubled understanding of things and processes.

“The Gods are happy.

They turn on all sides