there was no one to see her. Thus we are without sufficient evidence to say that she had no interest in them. This is the first time which I have known of two young ones being reared near each other. Regarding the numbers of eggs which one Cuckoo will produce in a single year, and which various naturalists have estimated at from twenty to five, we should favour the latter number, or perhaps even less; but we believe that it would differ very much with varying conditions. When we consider that in two years in this neighbourhood three pairs of Mountain Linnets have been hatching Cuckoos, another two pairs having done so in former years, while no case was observed in that time of other birds doing so, we are bound to place this bird as the favourite foster-parent of the locality; and if Cuckoos were laying many eggs the effect would be such as to curtail the foster-bird seriously in numbers. I cannot find a reason why this should be so, for there are plenty of other birds, such as Larks, Brown Linnets, Hedgesparrows, Robins, Wagtails, Chaffinches, Yellowhammers, &c, which might serve this purpose. It is also noticeable that the favourite is quite a local bird, as it does not extend into the* low part of the country, and hence it is not generally noticed in natural history works as one of the usual fosterparents of the Cuckoo. Another point to be observed is that this bird has little connection with woods, moors being its favourite haunt; while Cuckoos are very fond of frequenting plantations. We have seen in the one case that the egg resembled those of the foster-birds, while that each of the young birds differed in the colour of plumage. Then the date of leaving here—July 7th is the last date which the Cuckoo was heard. I believe that they do not stay long after we cease to hear them; for instance, one which frequented my garden or its vicinity since their arrival has disappeared, and while some may remain for a while, everything leads me to think that they flit about the end of July. Then of course the foster-birds here will not follow far; so that the young Cuckoos must shift for themselves, or obtain some guidance from parent Cuckoos or other promiscuous birds of their own species.—W. Wilson (Alford, Aberdeen).
Mallard and Pintail interbreeding in Captivity.—Last year I induced my friend Mr. R. Mann to pair a drake Pintail (Dafila acuta) with a female Wild Duck (Anas boscas), but a Mallard found access to his neighbour's mate, and her eggs hatched into pure-bred Mallards. This year the Pintail succeeded in pairing with a Wild Duck for a second time, and five eggs hatched. One duckling was killed by a Herring Gull, but the other four have feathered, and promise to be handsome specimens of this well-known cross. They most resemble the Pintail in immature plumage.—H.A. Macpherson (Allonby Vicarage, Cumberland).
Breeding Range of the Scaup-Duck.—I do not agree with your correspondent, Mr. Crossman (Zool. ante, p. 319), when he presumes that any
