At the annual International Exhibition of 1873, at South Kensington, we had two of these hives in full operation, an opening being made so that the bees had full access to the pasturage of the Horticultural and other gardens of the neighbourhood. Among the many visitors whose delight it was to watch the hidden working of the hives thus laid bare for inspection was His Grace the Duke of Sutherland, and he commissioned us to place one of these unicomb hives at the window of an anteroom adjoining his library at Stafford House, St. James's, which we accordingly did, the bees having an open flight over his own garden and St. James's Park, as the entrance faced that way. For a time this was an unfailing source of interest and gratification to His Grace and his visitors; but unfortunately a reverse came over the spirit of our dream. The hive was without the Venetian blinds, thus depending on the window-blind being carefully drawn down when the sun was shining. An oversight prevented this being attended to one day as usual: it was on the occasion of the visit of the Shah of Persia to Stafford House, when the servants were so much occupied that the secluded room which the bees were in was wholly neglected. The, consequence was that the rays of the burning June sun so distressed the bees that they hung out in clusters, the queen among them, at the outside entrance; the combs were at the same time melted, and fell from their foundations, and the brood was all ruined by heat '; in fact, the whole hive became a wreck. We managed after some trouble to save the bees, but His Grace was so disheartened by the catastrophe that, for fear of its repetition, though much to our disappointment, he declined re-stocking the hive. At the Paris Exposition Universelle of 1855 we also exhibited a hive of this description in full working order. The bees left London on the 5th of July of that year, and were placed in the Exposition on the following morning. An entrance was made for them through the side of the building, as before explained. Our bees had no national antipathies, and they immediately sallied forth to their "fresh fields and pastures new" in the Champs Elysées, the gardens of the Tuileries, the Luxembourg, etc., whence they soon returned laden with luscious store from French flowers. The Jurors of the Exposition awarded us a prize medal for beehives. A prize was also adjudged to us for the hive here described at the Crystal Palace Show in 1874; while a variation that we have made--consisting of four half-unicombs fixed cross-way like the sails of a windmill--obtained a like award at the Alexandra Palace Bee Show in 1876. The unicomb observatory hive is one which might have been suggested by the lines of Evans:--