The second grouping should be based upon the standing of the regimental unit. All the buttons worn by the regular army, for instance, should be placed in one sub-division; all those of the territorial army in another; and, as obsolete specimens are still procurable, sub-divisions should be reserved for the volunteer force, the old militia, and special forces which have been raised on special occasions. Of course the badges should be arranged according to the precedence accorded to the regiments for which they stand; thus, in the case of the regular army, the Household Cavalry should receive priority and be followed by the Dragoon Guards; then the Cavalry of the Line should take third place, whilst the fourth and fifth places should be given to the Royal Artillery and Royal Engineers. The Guards should be placed sixth, and the Infantry of the Line seventh. Badges of each of these divisions should then be arranged according to the seniority of the regiment. The Army List and the chapter on "Regimental Nomenclature" will give valuable help on this point. Finally, where regiments possess various badges for the different companies, these must be arranged in numerical order. In planning a collection, it is well to remember that badges are constantly changing their patterns, not in fundamental ways, it is true, but in ways which are quite sufficient to add zest to the hobby of collecting. Battle honours, for instance, have been frequently added in the past, whilst many changes are sure to take place in the future, on this score alone, as a result of the great war with Germany. After the Boer War, additions were made to the scrolls which encircle many regimental badges, and the same may be said of the Peninsular, Marlborough's wars, and every great campaign in which the British Army has figured. Thus it is clear that a collection of devices such as we have here in mind is full of interest, not only from the military and antiquarian but also the historical point of view. [Illustration: BADGE OF THE ROYAL DUBLIN FUSILIERS. BADGE OF THE ROYAL FUSILIERS (CITY OF LONDON REGIMENT). BADGE OF THE SEAFORTH HIGHLANDERS (5TH BATTALION). BADGE OF THE ROYAL REGIMENT OF ARTILLERY.] In addition to the gradual changes which have arisen, it must be mentioned that in 1881 the names of many regiments underwent changes and the badges suffered material alterations in consequence. Before the year in question, each army unit was known by its number and the crests bore distinguishing numerals. Thus the Wiltshire badge, which to-day depicts the Duke of Edinburgh's monogram within a circle, bore the figures "62" instead up till 1881. The collector will find these early devices of much interest, but, as a rule, they are fairly hard to obtain.