"A Phoenix was at first thought of, & is the ornament in the wooden modell of the pilar w{ch} I caused to be made before it was begun; but upon second thoughtes I rejected it, because it will be costly, not easily understood at that highth, and worse understood at a distance, and lastly dangerous, by reason of the sayle, the spread winges will carry in the winds. "The Belcony must be made of substantial well forged worke, there being noe need at that distance of filed worke, and I suppose (for I cannot exactly guesse the weight) it may be well performed and fixed according to a good designe for fourscore & ten poundes, including painting, All w{ch} is humbly submitted to your consideration. "July 28, 1675. "CHR. WREN." CHANGE OF SEX. Connected with the plumage of birds is an extraordinary problem which has baffled all research, and towards the solution of which not the slightest approach has been made. Among certain of the gallinaceous birds, and it has been observed in no other family, the females occasionally assume the male plumage. Among pheasants in a wild state, the hen thus metamorphosed, assumes with the livery a disposition to war with her own race, but in confinement she is spurned and buffeted by the rest. From what took place in a hen pheasant in the possession of a lady, a friend of the late Sir Joseph Banks, it would seem probable that this change arises from some alteration in the temperament at a late period of the animal's life. This lady had paid particular attention to the breeding of pheasants. One of the hens, after having produced several broods, moulted, and the succeeding feathers were exactly those of a cock. This animal never afterwards laid an egg. The pea-hen, has sometimes been known to take the plumage of the cock bird. Lady Tynte had a favourite pea-hen, which at eight several times produced chicks. Having moulted when about eleven years old, the lady and her family were astonished by her displaying the feathers peculiar to the other sex, and appearing like a pied peacock. In this process the tail, which was like that of the cock, first appeared. In the following year she moulted again, and produced similar feathers. In third year she did the same, and then had also spurs resembling those of the cock. The bird never bred after this change of her plumage. TILBURY FORT. The chief fame of Tilbury rests on the formation of the camp here, in the reign of Queen Elizabeth, to defend London against the Spanish invasion. Although it is unnecessary to recount the well-known circumstances which led to the formation of the Tilbury camp, it may not be out of place to give the famous speech of Queen Elizabeth on the occasion of her visit:--