We have no direct evidence as to the dimensions of ships of four and five banks. Polybios tells us that the crew of a Roman quinquereme in the first Carthaginian War, at a battle fought in 256 B.C., numbered 300, in addition to 120 soldiers. Now, the number 300 can be obtained by adding two banks of respectively 64 and 62 rowers to the 172 of the trireme. We may, perhaps, infer that the quinquereme of that time was a little longer than the trireme, and had about 3 ft. more freeboard, this being the additional height required to accommodate two extra banks of oars. Three hundred years later than the above-mentioned date Pliny tells us that this type of galley carried 400 rowers. We know no detailed particulars of vessels having a greater number of banks than five till we get to the alleged forty-banker of Ptolemy Philopater. Of this ship Callixenos gives the following particulars:--Her dimensions were: length, 420 ft.; breadth, 57 ft.; draught, under 6 ft.; height of stern ornament above water-line, 79 ft. 6 in.; height of stem ornament, 72 ft.; length of the longest oars, 57 ft. The oars were stated to have been weighted with lead inboard, so as to balance the great overhanging length. The number of the rowers was 4,000, and of the remainder of the crew 3,500, making a total of 7,500 men, for whom, we are asked to believe, accommodation was found on a vessel of the dimensions given. This last statement is quite sufficient to utterly discredit the whole story, as it implies that each man had a cubic space of only about 130 ft. to live in, and that, too, in the climate of Egypt. Moreover, if we look into the question of the oars we shall see that the dimensions given are absolutely impossible--that is to say, if we make the usual assumption that the banks were successive horizontal tiers of oars placed one above the other. There were said to have been forty banks. Now, the smallest distance, vertically, between two successive banks, if the oar-ports were arranged as in Fig. 14, with the object of economizing space in the vertical direction to the greatest possible degree, would be 1 ft. 3 in. If the lowest oar-ports were 3 ft. above the water, and the topmost bank were worked on the gunwale, we should require, to accommodate forty banks, a height of side equal to 39 ft. x 1 ft. 3 in. + 3 ft. = 51 ft. 9 in. Now, if the inboard portion of the 57 ft. oar were only one-fourth of the whole length, or 14 ft. 3 in., this would leave 57 ft. - 14 ft. 3 in. = 42 ft. 9 in. for the outboard portion, and as the height of gunwale on which this particular length of oar was worked must have been, as shown above, 51 ft. 9 in. above the water, it is evident that the outboard portion of the oar could not be made to touch the water at all. Also, if we consider the conditions of structural strength of the side of a ship honeycombed with oar-ports, and standing to the enormous height of 51 ft. 9 in. above the water-line, it is evident that, in order to be