It is evident from the foregoing sketch of the early history of flag signals that up to the middle of the seventeenth century the signals of the English navy were of the most elementary description. The first steps towards the introduction of a more efficient system were taken in 1647 when the "Right Honourable the Committee of the Lords and Commons for the Admiralty and Cinque Ports" issued "Instructions" on a more elaborate plan. The general instructions, dated 6th April, 1647, are preserved; but, unfortunately, the "Instructions for sailing," issued at the same time, which contained the signals, have not yet been brought to light. From the "supplementary instructions" preserved in the Harleian MSS., and printed by Sir Julian Corbett[377], it may be inferred that the British navy was at length drawing on a level with the navies of France and Spain in respect to its method of communicating orders. In 1653 a further great improvement was made[378], and a "code" of instructions, with the accompanying signals, now appears, issued "By the Right Honourable the Generals and Admirals of the Fleet," and signed by Blake, Deane, and Monk. The following were the flags to be used for signals: A weft of the ensign or jack, a pendant, and the three flags--red, blue, and white--already in existence as flags of command. The signal to "Engage the enemy," doubtless that used by Monk in fighting Tromp, and by Blake in his last glorious action of Santa Cruz, was made "by shooting-off two guns and putting a red flag over the fore topmast-head." This Commonwealth code was further expanded in 1665, under the guidance of the Duke of York, afterwards King James II. In a supplementary order of the same year, a red and white striped flag first appears as the signal to chase. In 1672 and 1673 the instructions and signals were further amplified and then printed, being possibly the first set of naval fighting instructions to be put into print. In a finely bound manuscript copy of the 1673 Instructions, now in the Admiralty Library, which, from internal evidence, was prepared about 1689, we have the earliest surviving example of the "signal book" proper. Hitherto the signals had been embodied in the various Articles of Sailing and Fighting Instructions, the appropriate flag being merely described in the text of each article, but no diagram or coloured representation of the flag being given. In this MS. we have for the first time coloured drawings of flags arranged in order, with the meaning and place where hoisted against each in parallel columns, a convenient method of systematising the signals that was not followed in the official printed "Instructions" for a century. The flags of the manuscript are as follows: