This latter system, invented by Dr. Legrand, was evidently intended by its original contriver to apply to lines of perforation of which the holes were so regularly spaced that all intervals of 2 centimetres in the same line contained the same number of holes, all these holes being exactly the same distance apart. Irregularity in the spacing of the holes does not seem to have been contemplated, but, as the vast majority of machines make holes spaced at regular intervals, this system of taking a gauge of 2 centimetres, applying it to a line of perforations, and counting the holes contained in that space in order to get a number by which that particular perforation may always be identified, works admirably in practice in by far the greater number of cases. St. Vincent is one of those cases in which it entirely fails to satisfy our requirements (that is, in as far as the stamps of Section I. are concerned), and its misuse has led to the recording of such a bewildering number of different perforations, simple and compound, that no one has ever yet been bold enough to give a properly arranged list of them, or to attempt to explain how so many varieties arose. A description of the two perforations will explain all this. That made by the A machine is well known in many other British Colonies—Antigua, Bahamas, Barbados, Ceylon, Grenada, Natal, Queensland, St. Helena, Trinidad, Turks Islands, Western Australia—that is, in most of the Colonies whose stamps were printed from plates prepared by Messrs. Perkins, Bacon & Co., and is one of the best known perforations in the world of Philately. Although its eccentricities are trifling compared with those of its fellow, the B machine, since it was in use in St. Vincent before that one, we take the description of its perforation first.