As I have often remarked that redwings are some of the first birds that suffer with us in severe weather, it is no wonder at all they retreat from Scandinavian winters: and much more the ordo of grallae, who, all to a bird, forsake the northern parts of Europe at the approach of winter. 'Grallae tanquam conjugatae unanimiter in fugam se conjiciunt; ne earum unicam quidem inter nos habitantem invenire possimus; ut enim aestate in australibus degere nequeunt ob defectum lumbricorum, terramque siccam; ita nec in frigidis ob eandem causam,' says Eckmarck the Swede, in his ingenious little treatise called Migrationes Avium, which by all means you ought to read while your thoughts run on the subject of migration. See Amoenitates Academicae, vol. iv, p. 565.
Birds may be so circumstanced as to be obliged to migrate in one country and not in another: but the grallae (which procure their food from marshes and boggy grounds) must in winter forsake the more northerly parts of Europe, or perish for want of food.
I am glad you are making inquiries from Linnaeus concerning the woodcock: it is expected of him that he should be able to account for the motions and manner of life of the animals of his own Fauna.
Faunists, as you observe, are too apt to acquiesce in bare descriptions, and a few synonyms: the reason is plain; because all that may be done at home in a man's study, but the investigation of the life and conversation of animals, is a concern of much more trouble and difficulty, and is not to be attained but by the active and inquisitive, and by those that reside much in the country.
Foreign systematics are, I observe, much too vague in their specific differences; which are almost universally constituted by one or two particular marks, the rest of the description running in general terms. But our countryman, the excellent Mr. Ray, is
