_British Guiana_ presents probably the most difficult set of stamps that any collector ever attempted to get together. The King's collection is representative, but is strongest in the issues of 1860-82: they formed the basis of a display before the Royal Philatelic Society on March 17, 1910, and included most of the stamps in a wide range of shades, all the rarities being present, unused, except the 24 cents perforated 12 of 1860 on thin paper, and the provisional series of 1862, and a few of the "officials." The used portion was practically complete, and in the case of the 1882 provisionals there were entire and also reconstructed sheets, showing all the varieties. The _Barbados_ collection, which was shown by His Majesty at the Imperial Stamp Exhibition held by the Junior Philatelic Society in London in 1908, was exceptionally rich in the scarce "1d." on 5s. provisional, of which there were no fewer than a pair and two single copies, four in all, in the unused condition, and five used pairs and a number of single used copies. _Hong Kong_ and _Grenada_, _Bermuda_, _Trinidad_ and _Turks' Islands_ have also been arranged and exhibited, as well as a small but choice collection of the stamps of _Nevis_, which contains, among other items, the beautiful card proofs of the first 1d. in green, 4d. in dull purple, 6d. in orange, and 1s. in lake. There are two reconstructed sheets of the 1d. perforated 13, and the 4d. rose, unused; the 6d. grey and 1s. green, used and unused. Of the 1867 set the 1d. is shown unused, the 4d. both used and unused and the 1s. used. Of the lithographs there are four mint sheets of the 1d., a mint sheet of the 4d. and another of the 6d., the 1s. in light and dark green; and there are two entire sheets of the 1d. perforated 11½. [Illustration: THE TWO PENCE "POST PAID" STAMP OF MAURITIUS. Unique block showing the error (the first stamp in the illustration) lettered "PENOE" for "PENCE". (_In the collection of H.M. the King._)] Comparatively little is known of the stamp-collections of other monarchs, but both King Alfonso of Spain and King Manuel are known to have formed collections of the stamps of their respective realms. The Spanish King's expressed desire to add the stamps of Portugal to his collection led to the reprinting of certain of the obsolete stamps of which the dies were on hand at the Lisbon Mint; these are the stamps known as the "King of Spain Reprints," a complete set of which was presented by King Manuel to the Reference Collection of the Royal Philatelic Society.