The reason of the great change was readily apparent: organisation had now been perfected. In the first place, the whole width of the cut was laid down in railway tracks, tier above tier at the different levels, so that the view was like the approach to the metropolitan terminus of one of the world's great railways. Up and down these tracks there came and went without ceasing the spoil-trains, now composed of larger trucks than formerly, with new and ingenious devices for rapid unloading. The number of steam shovels visible was much larger than in 1906, yet they were kept constantly busy, and all the time the drilling machines were at work boring holes for charges of dynamite, and gangs of men were completing the preparations for explosions in other holes already made.[18] Yet if the eyes were raised for a moment from the busy scene below, they rested on a silent wilderness of tropical forest, stretching unbroken to the horizon. I stayed until, at the approach of sunset, the work of the shovels ceased, and hundreds of men swarmed out of the Cut, and sought their quarters and the evening meal. But all was not over for the day, for now, when the Cut was cleared, the shot-firing began. At intervals there occurred a deafening explosion, the earth trembled as in a considerable, but preternaturally short, earthquake, and masses of rock rolled down the slopes, disintegrated and ready for the shovel-man when he should arrive next morning. I paid many visits to the Cut, between Empire and Pedro Miguel, but oftenest at Culebra itself. The sight never palls, and is one of the wonders of the world. The Pyramids are another wonder of the world which in common with many thousands in all ages I have thought it worth going to see--but to go to Culebra is as if one were privileged to watch the building of the Pyramids. Yet how few go to the Isthmus on purpose to see these things, and, _mirabile dictu_, how few Americans! How is it that this people, so enthusiastic in all that relates to national achievement and addicted to foreign travel, does not include the Isthmus among its many recognised places of pilgrimage? Of the Americans whom I met on the Zone there was scarcely one who had come voluntarily for pleasure. The hotel accommodation, it is true, is limited, but it is more than sufficient for present needs, and is good, as hotels in the tropics are reckoned. Moreover, Panama is now one of the healthiest places in the Equatorial Zone. English tourists going out to the West Indies by the Royal Mail are generally able to cross the Isthmus and see something of the work while their ship is unloading at Colon; but I would venture to suggest, to such of these as care to follow the world's progress, that they should make arrangements beforehand to step off at Colon, cross to Panama, put up there, visit thence the Canal works at various points, and proceed by their next ship. The West Indian tourist season coincides with the dry season on the Isthmus.