Afterwards, an improvement was introduced in the form of a rough sledge, called "moreg," to which the oxen were harnessed by a yoke, and on which the driver stood as he guided his team round the threshing-floor. This instrument is mentioned in Isa. xli. 15: "Behold, I will make thee a new and sharp threshing instrument having teeth [or mouths]: thou shalt thresh the mountains, and beat them small, and shalt make the hills as chaff." Mention is also made of the same implement in 2 Sam. xxiv. 22, where it is related that Araunah the Jebusite offered to give David the oxen for a burnt-sacrifice, and the moregs and other implements as wood with which they could be burned. The work of treading out the corn was a hard and trying one for the oxen, and it was probably on this account that the kindly edict was made, that the oxen who trod out the corn should not be muzzled. As a rule, the cattle were not fed nearly as carefully as is done with us, and so the labours of the threshing-floor would find a compensation in the temporary abundance of which the animals might take their fill. [Illustration: OXEN TREADING OUT GRAIN.] After the corn was threshed, or rather trodden out, the oxen had to draw it home in carts. These were but slight improvements on the threshing-sledge, and were simply trays or shallow boxes on a pair of wheels. As the wheels were merely slices cut from the trunk of a tree, and were not furnished with iron tires, they were not remarkable for roundness, and indeed, after a little time, were worn into rather irregular ovals, so that the task of dragging a cart over the rough roads was by no means an easy one. And, as the axle was simply a stout pole fastened to the bottom of the cart, and having its rounded ends thrust through holes in the middle of the wheels, the friction was enormous. As, moreover, oil and grease were far too precious luxuries to be wasted in lubricating the axles, the creaking and groaning of the wheels was a singularly disagreeable and ear-piercing sound. [Illustration: EASTERN OX-CART.] The common hackery of India is a good example of the carts mentioned in the Scriptures. As with the plough, the cart was drawn by a couple of oxen, connected by the yoke. The two kinds of cart, namely, the tray and the box, are clearly indicated in the Scriptures. The new cart on which the Ark was placed when it was sent back by the Philistines (see 1 Sam. vi. 7) was evidently one of the former kind, and so was that which was made twenty years afterwards, for the purpose of conveying the Ark to Jerusalem.