tliat he has usually found the egg of the Cuckoo in the nests of the following species ; — Common, Reed, 
and Yellow Buntings, Robin, Flycatcher, Greenfinch, Chaffinch, Linnet, Hedge-Accentor, Pied and Yellow 
Wagtails, and Tree- and Meadow-Pipits, occasionally in those of the Skylark, Chiff-chaff, and Willow-MYen ; 
in one instance in that of a Blackbird, in another in that of the Red-backed Shrike, and thrice in those of the 
Hartford AVarbler. 
Dr. Baldamus, in ‘ Naumannla,’ 1853, p. 307, has some most interesting remarks on the fact, as he con- 
siders it, that the egg of the Cuckoo is always found to present a very recognizable resemblance to the 
normal appearance of the egg of the species in whose nest it is de])oslted. In ‘Naumannla,’ 1854, p. 415, 
he gives a list of references to a plate in which are figured sixteen Cuckoo’s eggs, selected to show that this 
is the case. The similarity in many instances is very obvious, and the subject of the article, which does not 
seem to be generally known to British ornithologists, deservedly merits further attention. If the Doctor’s 
assertion he true, it adds still more to the wonderfully mysterious economy of this bird. 
Mr. Alfred Newton informs me that he has more than once found two Cuckoo’s eggs deposited in the 
same nest. He also tells me that it not unfrequently lays its eggs in the nest of the Brambling in Northern 
Lapland. 
Although so much has been written on the means by which the egg is deposited in the nest, yet nothing 
quite positive has been ascertained ; hut a considerable amount of certainty has been the result of repeated 
watchings. The generally received opinion is, that the Cuckoo drops her egg on the bare ground, carries it 
in her mandibles, and jdaces it in the foster-nest ; indeed there are such nests, as those of the Wren and the 
Robin, which, when built in the hole of a wall, will admit of no other means of deposit ; certain it is that the 
eggs of the little green Chalcifes of Australia cannot have been placed in the domed nests of the Maluri in 
any other way. 
When the Cuckoo takes up its station near a garden, it hunts, in the early morning, the ivy-clad wall for 
the nest of the Wagtail as closely as a schoolboy, next the espalier-apples trained beside the walk, the 
flower-covered trellis over the door of the mansion, the TFistaria upon the railing of the steps, or wherever 
it is likely the bird may have fixed upon for a breeding-place ; at other times it watches the Wagtail flying 
from the boat-house, on the rafters of which, or among the thatch, it may have jdaced its nest. It will resort 
to the more exposed nest of the Flycatcher, often in close proximity to the house ; or the actions of the 
Robin or the Wren may attract its attention to the hidden nest on the bank-side. These depositories 
once discovered, the egg is inserted at the proper moment for the development and well-being of the future 
nestling. 
The following notes on the nidificatlon of the Cuckoo were the result of some observations made by myselt 
in the garden of Mr. De Vitre, at Formosa, near Maideidiead, in Berkshire, in May and June 1860. A 
pair of Wagtails had built a nest on a beam of the boat-house, two yards distant from the edge of the 
roof, and, when first noticed, were in a state of great excitement from the presence of a Cuckoo. The 
latter succeeded in depositing an egg, which, with those of the Wagtails, was taken on the 21st of May. 
In the beginning of June, Briggs (the gardener) and myself observed another Cuckoo hunting the espalier 
apple-trees in the inner garden ; among which we afterwards found a Wagtail’s nest with five eggs — 
four belonging to the little architect, and one to the parasite ; when first seen, the latter was on the outside 
of the others. On the 18th all the eggs were hatched, nearly simultaneously ; and the young Cuckoo 
and the young Wagtails continued to occupy the nest in company until the third day, when, at five o’clock 
in the morning, the latter were found dead on the border beneath the tree : the parasite had now the nest 
al[ to itself, and, when I examined it on the 22nd, was still callow, helpless, and blind. On the evening 
of the 6th of July, the young Cuckoo was just able to hop out of its nest, and could even manage to fly a 
short distance. Its weight at this time was exactly three ounces. 
The eggs of the Cuckoo simulate so closely, both in size and colouring, those of most of the birds to 
whose care they are confided, that to many persons they would be undistinguishable. How singular it is that 
the eggs of so large a bird should be so small ! Here again is mystery, fraught with thought and interesting 
speculation for the theorist. The development of the chicks in the egg of the parasite and in those of the 
fosterparent, whatever it may be, goes on simultaneously, and all are hatched as near the same time as 
possible, that is, in about twelve or fourteen days. For the first two or three days the callow, blind, and 
helpless young can scarcely be distinguished one from the other ; by the end of that time the parasite is 
generally left sole tenant of the nest, and if search be made for its late companions, they will be found dead 
on the ground. As to how they are ejected there is much diversity of opinion : the general belief is that 
they are shouldered out by the parasite ; but from this I entirely dissent, for the simple reason that, judging 
from my own observation, I do not believe that at the end of the third day the parasite has the physical 
power requisite to eject the rightful possessors from a deep cup-shaped or a domed nest. By whom then is 
this unseemly cruelty performed ? Is it by the old Cuckoo, which is constantly seen in the neighbourhood of 
the nest, or by the fosterparents ? May we not more readily imagine that it has been done by the latter, 
who, having bestowed all their attention on the parasite, thus cause the death of their own young, which 
are then cleared out of the nest in the same way as broken eggshells, fseces, and other extraneous matters ? 
