"Ready to fill like the last," said Harry. "That's the proposition that jest beat us at first. There wasn't enough trucks nor locomotives to begin with, and not enough tracks, so these fine diggers wasted half their time; but we've fixed it a while since. Soon as a train's loaded it's pulled back, while an empty spoil train crosses the switches behind. That comes over another switch just behind the digger, and so right on alongside, the last truck just in position for loading, the first 'way ahead. Then, as you've seen for yourself, we move along, a few inches after every dig, filling the trucks as we go."

"And then?" asked Jim. "What happens? Where is the dirt taken? Who unloads the trucks?"

"Gee! You are a chap fer questions. Where does it go? Away up there, at the far end of the river gully, where the Lake of Gatun'll be, there's a sight more dirt than this being taken from the isthmus. Some of that's being dumped at the dam just away over our heads; some of it's being emptied outside Panama, filling up a swamp through which the canal will run. Reckon there won't be swamps when we're done. There'll be good hard ground, and houses'll be built on a spot where there's fever nowadays. We're using dirt at this end in the same way; but you was asking about the dumping?"

Jim nodded, and looked at the spoil train being hauled away. "The gangs of niggers do it, I guess," he said. "But it must take longer than the loading by a long way; at least that's what one would imagine."

"Jest about seven minutes fer the whole train," smiled Harry. "My davy on it! You ask how? Wall, listen here. I've been here a long while, and in them days when we was fixed badly fer more trucks niggers did see to clearing the spoil trains—and precious bad niggers they was, too, about that time. Yer see, they mostly comes from the West Indian Isles, and somehow the place didn't seem to suit 'em. They was too slack to work much; but guess our officials fixed the trouble. They found it was the food, and now every nigger employed on the works gets his meals regular at a Commission barracks, and sech meals as gives him strength. But we was talking of unloading. See that truck 'way in front of the trains, the one just close to the engine? Wall, that's the Lidgerwood apparatus, and guess it beats creation. There's a plough right forward of the train, and a wire rope attached to it. When the spoil train has been brought to the place where the dirt's to be dumped, niggers or Europeans let down the truck ends, so's the whole train's one long platform. The plough then gets pulled from end to end, and shoots the dirt out. Seven minutes for a whole train, siree! Lightning ain't in it!"

Whistles sounded at this minute, and promptly Harry shut down his levers and leaped from the cab.

"Guess you've done right well fer a first time," he said. "In a day you'll be able to get to at it alone. Anyway, you've earned your grub. Come along to the Commission hotel; there's meals there for all whites, and no one can grumble at them."

Wherever he went Jim found something to interest him, so much so that it was a matter of wonder to him that, though he had often been close to the isthmus, he had had no idea of the extraordinary bustle taking place there. It was so extremely surprising to find small towns sprung up where he was assured there was but a single native hut before, to discover buildings so temptingly cool and elegant in appearance, and to learn that America not only employed labour, but provided quarters, food, and recreation for her employees. And here was another example. Harry took him away from the lock cutting, where one of these days a double tier of three locks will elevate ships from the Atlantic, and introduced him to his friends in one of the well-equipped hotels erected for the accommodation of white employees. Hundreds of men were streaming up the steps as they arrived, and passing in behind the copper-gauze screens of the veranda. Jim noticed that all bore much the same appearance—for the most part clean shaven, with here and there some wearing moustaches and beards. Dressed in rough working clothes, with broad-brimmed hats, none showed signs of ill health. There was a buzz of eager conversation as they washed before the meal, and a loud clatter from many tongues as they sat at the tables. As to the food, it was plain, abundant, and well cooked.

"Costs jest fifty cents a day," explained Harry. "If you've finished we'll get to the club. We usually go along fer a smoke at dinner-time. 'Sides, there's a cable of interest now and agin, and sometimes letters."

A few minutes with Harry at the club served, in fact, to banish any doubts which Jim may have had as to remaining on the isthmus. For here was comfort and recreation at the same time, and plenty of men with whom to make friends.