The number of feathers in a plume requires to be stated; it will usually be found to be three, five, or seven, though sometimes a larger number are met with. When it is termed a double plume they are arranged in two rows, the one issuing above the other, and a triple plume is arranged in three rows; and though it is correct to speak of any number of feathers as a plume, it will usually be found that the word is reserved for five or more, whilst a plume of three feathers would more frequently be termed three ostrich feathers. Whilst they are usually white, they are also found of varied colours, and there is even an instance to be met with of ostrich feathers of ermine. When the feathers are of different colours they need to be carefully blazoned; if alternately, it is enough to use the word "alternately," the feather at the extreme dexter side being depicted of the colour first mentioned. In a plume which is of three colours, care must be used in noting the arrangement of the colours, the colours first mentioned being that of the dexter feather; the others then follow from dexter to sinister, the fourth feather commencing the series of colours again. If any other arrangement of the colours occurs it must be specifically detailed. The rainbow-hued plume from which the crest of Sir Reginald Barnewall[19] issues is the most variegated instance I have met with. Two peacock's feathers in saltire will be found in the crest of a family of Gatehouse, and also occur in the crest of Crisp-Molineux-Montgomerie. The pen in heraldry is always of course of the quill variety, and consequently should not be mistaken for a single feather. The term "penned" is used when the quill of a feather is of a different colour from the remainder of it. Ostrich and other feathers are very frequently found on either side of a crest, both in British and Continental armory; but though often met with in this position, there is nothing peculiar about this use in such character. German heraldry {252} has evolved one use of the peacock's feather, or rather for the eye from the peacock's feather, which happily has not yet reached this country. It will be found adorning the outer edges of every kind of object, and it even occurs on occasion as a kind of dorsal fin down the back of animals. Bunches of cock's feathers are also frequently made use of for the same purpose. There has been considerable diversity in the method of depicting the ostrich feather. In its earliest form it was stiff and erect as if cut from a piece of board (Fig. 478), but gradually, as the realistic type of heraldic art came into vogue, it was represented more naturally and with flowing and drooping curves. Of later years, however, we have followed the example of His Majesty when Prince of Wales and reverted to the earlier form, and it is now very general to give to the ostrich feather the stiff and straight appearance which it originally possessed when heraldically depicted.