The development of speed in torpedo JOats is a study of special interest, and he effect of fhe rapid increase of speed n this class of vessel is by no means confined to it, as a basis is thns formed 'or the introduction of many iruprovements, and consequent higher speed, in vessels of large size. The question is often asked, What is he probable increase in speed to be in he future and in what direction are we o look for improvements with a view o obtain it? One evident mode of inreasing speed is by augmenting the ize of the vessel and its machinery, as, f the proportion of weight allotted to he machinery is the same a greater peedwill be obtained. To secure speed )y this means, however, does not involve any special skill or anything in he nature of improvement. All that is necessary is simply to reproduce the ame description of huil and engines, but of a larger size. Greater skill is shown where an exeptional speed is obtained within mail dimensions, and in this respect ihe results obtained by M. Kormand of Havre in his latest achievements are speciallycreditable. No doubt material of greater strength than generally adopted would admit of lighter scantings for the hulls. Probably the en;ines themselves may be driven at a ngher number of revolutions and posibly improvements in water tube boilrs may enable a reduotion of weight o be secured without loss of efficiency. Aluminium may also be introduced as a Bubstitute for heavier metáis. It is in he saving of weight for power that advance may be looked for in the imme.iate futnre, and the shipbuilder can now see his way to obtain from 32 to 34 knots. - A. F. Yarrow in Cassier's Magazine.