From time to time, also, after paying his rates and taxes, a pontist should recall to memory the rare great “finds” which his long research has unburied. To enjoy a “find” properly is to feel sure that one has made a gallant entry into El Dorado. Never shall I forget the elation that came to me when at the same moment I came upon two wondrous facts: first, that Nature had created lofty arched bridges, like the Rock Bridge in Virginia and the Pont d’Arc over the Ardèche[1] in France; next, that the earliest archways in handicraft were copied from Nature’s models, and copied with a plodding mimicry, for they were built not with converging archstones, but with courses of stone laid horizontally, just as Nature in stratified rocks had put one flat layer upon another (p. 155). To discover facts of this kind is a joy that keeps the heart youthful. Study is not a friend to the Income Tax, but it puts trouble out of mind, a true Nepenthe. Even aged scientists at the Pasteur Institute grow young and merry when they isolate a virulent microbe which for a long time has baffled their curiosity. Yes, research ought to be very popular; in its companionship any person of sense may learn gladly as an “old boy” from his fifteenth year to the seventieth, working daily for eight thorough hours. How many hours in all would be given to study and thought? In fifty-five years there are twenty thousand and seventy-five days; these we multiply by eight and behold! we have been sedulously youthful for 160,600 hours. Here is a record of industry; it may be unexampled until centenarians become as frequent as M. Metchnikoff wants them to be; and yet, after all, is it a great record? Great it may be in its relation to human weakness, but it means only a trivial apprenticeship to any vocation that lures the mind with illimitable open fields. Our happy toil is nothing more than a gleaner, but it should keep us from being prigs--little students overfed on a little knowledge and too foolish to feel ignorant. What Sir Clifford Allbutt has told the public about the immaturity of modern science is true also of the study of bridges and roads; here, too, knowledge is often hollow while ignorance has a solid weight, even among men who are not content with current formulas. “In every direction we seem to travel but a very short way before we are brought to a stop; our eyes are opened to see that our path is beset with doubts, and that even our best-made knowledge comes but too soon to an end. In every chapter arises problem after problem to beckon us on to farther investigation; yet this way and that we are so baffled by darkness and ignorance that to choose one of these problems for attack, one which is likely to repay his labour, is often beyond the scope of a junior candidate.”[2]