In nearly all the northern lands small trees grow irregularly all over the camp, and in order to plough the land these trees must be dug up. Machines are manufactured in the United States to deal with land containing tree roots. They perform the double operation of cutting roots under ground and ploughing up the surface, but they have not yet been introduced into the Argentine in large numbers. Other machines dig holes for fence posts at the rate of fifty holes per hour, and they can be so accurately gauged that the posts may be firmly fixed without expending much labour in ramming. The naphtha engine is likewise used with great advantage for traction purposes. A striking instance of this is to be found at Rio Gallegos, where many naphtha engines are engaged in the work of carrying wool over a track of more than 300 kilometres, a feat which would be quite impossible with animal labour, owing to the rocky and broken condition of the roads. As the Santa Fé Land Company owns a great diversity of land, they have used both the steam traction and the naphtha engines, and time will show which machine is to be recommended. It is a pity that the agricultural implement importers of Buenos Aires should have recently formed themselves into a ring to lift prices, because their doing so will certainly tend to lessen the progress which agriculture is making in the Argentine. These combinations, however, will not deter the Company from continuing its "march of progress," but it comes hard on the colonist, who, after all, is the chief factor in building up the fortunes of the great importing houses of Buenos Aires. One of the greatest competitors of the British-built traction engine is the Hart-Parr oil engine, a splendid agricultural tool, which is invaluable where ordinary fuel is not easily procurable.