. The birds of Siberia; a record of a naturalist's visits to the valleys of the Petchora and Yenesei . wise thisquestion might easily be settled. It is obviously mucheasier to record the date of arrival of a bird than of itsdeparture. In the one case a single entry is sufficient;in the other, memoranda may have to be daily recordedfor weeks. At Valkenswaard, in Holland, I noticed thatthe earliest migrants were those with the widest whose breeding-range extended to or beyondBritain were the earliest to breed, whilst those whoseeggs I was most anxious to obtain, those whose breeding-
. The birds of Siberia; a record of a naturalist's visits to the valleys of the Petchora and Yenesei . wise thisquestion might easily be settled. It is obviously mucheasier to record the date of arrival of a bird than of itsdeparture. In the one case a single entry is sufficient;in the other, memoranda may have to be daily recordedfor weeks. At Valkenswaard, in Holland, I noticed thatthe earliest migrants were those with the widest whose breeding-range extended to or beyondBritain were the earliest to breed, whilst those whoseeggs I was most anxious to obtain, those whose breeding- 2o6 THE MIGRATION OF BIRDS range did not extend to our islands, were very late inarriving. It seems to be a curious fact that, as a generalrule—though subject, no doubt, to many exceptions—thebirds who have come from the lonoest distance arrivethe earliest. The facts of migration are, however, somany, and the theories which they suggest are so various,that we must brino- this ramblinof, if not irrelevantchapter to an end, and return to the narrative of ourdoings in the valley of the OLD RUSSIAN SILVER CROSS
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