OTHER CUCKOOS (1921) 171 
It should be added that these nineteen eggs were 
obtained from nests of a greater number of different 
pairs of fosterers than was the case with my 
Meadow Pipit Cuckoo A. In every case where 
Mr. Scholey took eggs he replaced them with 
others, brought from a marsh where Reed Warblers 
are particularly abundant, and allowed them to 
hatch, although in some instances the foster birds 
did forsake and rebuild. 
Mr. A. E. Lees worked an area of some five 
miles along the banks of a midland river. This 
stretch was cut up into territories by five hen 
Cuckoos, three being parasitic upon Reed Warblers 
and two upon Sedge Warblers. Bearing away from 
the river in one direction he came into the territories 
of five more hen Cuckoos, parasitic upon Hedge- 
sparrows. In another direction he met with still 
another Cuckoo but found only one of her eggs, 
and that in a Pied Wagtail’s nest. 
Of his riverside birds the most prolific in 1921 
was one duping Sedge Warblers, and from this 
Cuckoo he obtained the fine series of ten eggs, an 
achievement which, for that particular fosterer, 
has probably never been equalled in this country. 
One can only estimate the probable laying dates 
from the state of incubation of the Cuckoo’s eggs, 
