Emu, sexes and incubation of.
Emulation of singing birds.
Endurance, estimation of.
Energy, a characteristic of men.
England, numerical proportion of male and female births in.
Engleheart, Mr., on the finding of new mates by starlings.
English, success of, as colonists.
Engravers, short-sighted.
Entomostraca.
Entozoa, difference of colour between the males and females of some.