left at the end of July.  I should think, however, Tree and Meadow Pipits, Skylarks and Stonechats, from their numbers and the numbers of their nests, must be the foster-parents most usually selected; other favourites, such as Wagtails, Hedgesparrows, and Robins, being comparatively scarce in that part of the Island, and Wheaters, which were numerous, had their nests too far under large stones to give the Cuckoo an opportunity of depositing her eggs there.  I should have been very glad if I could have made a good collection of Cuckoos’ eggs in the Channel Islands, and, knowing how common the bird was, I fully expected to do so, but I was disappointed, and consequently unable to throw any light on the subject of the variation in the colour of Cuckoos’ eggs, as far as the Channel Islands are concerned, or how far the foster-parents had been selected with a view to their eggs being similar in colour to those of the Cuckoo about to be palmed off upon them.  The only Cuckoos’ eggs I saw were a few in the Museum, and in one or two other small collections:  all these were very much the same, and what appears to me the usual type of Cuckoo’s egg, a dull greyish ground much spotted with brown, and a few small black marks much like many eggs of the Tree or Meadow Pipit.  It is hardly the place here to discuss the question how far Cuckoos select the nest of the birds whose eggs are similar to their own, to deposit their eggs in, or whether a Cuckoo hatched and reared by one foster-parent would be likely to select the nest of the same species to deposit its own eggs in; the whole matter has been very fully discussed in several publications, both English and German; and Mr. Dresser has given a very full resume of the various arguments in his ‘Birds of Europe’; and whilst fully admitting the great variation in the colour of the Cuckoos’ eggs, he does not seem to think that any particular care is taken by the parent Cuckoo to select foster-parents whose eggs are similar in colour to its own; and the instances cited seem to bear out this opinion, with which, as far as my small experience goes, I quite agree.

Whilst on the subject of Cuckoos I may mention, for the information of such of my Guernsey readers who are not ornithologists, and therefore not well acquainted with the fact, the peculiar state of plumage in which the female Cuckoo occasionally returns northward in her second summer; I mean the dull reddish plumage barred with brown, extremely like that of the female Kestrel:  in this plumage she occasionally returns in her second year and breeds; but when this is changed for the more general plumage I am unable to state for certain, but probably after the second autumnal moult.  The changes of plumage in the Cuckoo, however, appear to be rather irregular, as I have one killed in June nearly in the normal plumage, but with many of the old feathers left, which have a very Kestrel-like appearance, being redder than the ordinary plumage of the young bird; some of the tail-feathers, however,