LETTER XXV.
Dear Sir, It gives me satisfaction to find that my account of the ousel migration pleases you. You put a very shrewd question when you ask me how I know that their autumnal migration is southward? Was not candour and openness the very life of natural history, I should pass over this query just as a sly commentator does over a crabbed passage in a classic; but common ingenuousness obliges me to confess, not without some degree of shame, that I only reasoned in that case from analogy. For as all other autumnal birds migrate from the northward to us, to partake of our milder winters, and return to the northward again when the rigorous cold abates, so I concluded that the ring-ousels did the same, as well as their congeners the fieldfares; and especially as ring-ousels are known to haunt cold mountainous countries: but I have good reason to suspect since that they may come to us from the westward; because I hear from very good authority, that they breed on Dartmoor; and that they forsake that wild district about the time that our visitors appear, and do not return till late in the spring.
I have taken a great deal of pains about your salicaria and mine, with a white stroke over its eye and a tawny rump.[e1] I have surveyed it alive and dead, and have procured several specimens, and am perfectly persuaded myself (and trust you will soon become convinced of the same) that it is no more nor less than the passer arundinaceus minor of Ray. This bird, by some means or other, seems to be entirely omitted in the British Zoology; and one reason probably was because it is so strangely classed in Ray, who ranges it among his picis affines. It ought no doubt to have gone among his aviculæ caudâ unicolore, and among your slender-billed small birds of the same division. Linnæus might with great propriety have put it into his genus of motacilla; and motacilla salicaria of his fauna suecica seems to come the nearest to it. It is no uncommon bird, haunting the sides of ponds and rivers
