feet being as great as that resting upon them. Thus they swing

along like a pacing horse, except that there are four rows of

feet instead of two, each foot being taken out of the water as it

is swung forward, the first and fourth and second and third rows

being worked together. Although, on account of their size, which

covers several acres, they can go in any water, they give the

best results on Mediterraneans and lakes that are free from ocean

rollers, and, under favourable conditions, make better speed than