The Columba oenas of Europe roosts on trees and builds its nest in holes, either in trees or the ground ("Var.
of Animals," Volume I., page 183).) (which is partly, indeed almost entirely, a wood pigeon), there is no other rock pigeon with which our domestic pigeon would cross--that is, if several exceedingly close geographical races of C.livia, which hardly any ornithologist looks at as true species, be all grouped under C.livia.

(112/4.

Columba livia, the Rock-pigeon.

"We may conclude with confidence that all the domestic races, notwithstanding their great amount of difference, are descended from the Columba livia, including under this name certain wild races" (op.cit., Volume I., page 223).) I am writing higgledy-piggledy, as I re-read your letter.

I thought that my letter had been much wilder than yours.