works at present used by our navy and general marine, though in many respects not devoid of merit, have always struck us as faulty in two particulars. They aim at comprising a great multiplicity of details, many of which relate to matters only remotely bearing upon the main objects of the treatise—and they are deficient in that clearness of arrangement, without which, the numerous facts and formulæ composing the body of such works are little else than a mass of confusion. The extraction of the really useful rules and principles from the multifarious matters with which they are thus encumbered, is a task for which seamen are little likely to have either time or inclination, and it is therefore not surprising that our highly intelligent navy exhibits so many instances of imperfect knowledge upon points which are elementary and fundamental in the science of navigation.
We think that Mr. Maury has, to a considerable degree, avoided the errors referred to; and while his work comprises a sufficient and even copious statement of the rules and facts important to be known in the direction of a ship, he has succeeded, by a judicious arrangement of particulars and by clearly wrought numerical examples, in presenting them in a dis-embarrassed and very intelligible form. With great propriety he has rejected many statements and rules which in the progress of nautical science have fallen into disuse, and in his selection of methods of computation, has, in general, kept in view those modern improvements in this branch of practical mathematics in which simplicity and accuracy are most happily combined. Much attention to numerical correctness seems to pervade the work. Its style is concise without
