l'coplo havo au idea that tho hen sits on the eggs for f time, and when the time comes for hatuhing, thechick burstsforth. Therc never was a givatcr jnistako. The chick, until liberated frem the shell by outsido aid, is as incapable of motion as if it formed a solid egg, which ït nearly does. You niight as wcll inclose a man in an iron boiler, and teil him to get out of it without help. Tho chick grows on the inside of tho shell, and bursts up a very small scalc. Of course when it does this, it at the samo time " breaks in that spot" the inside of tho egg. This adniits the air ; in a short timo it breathes and gets strongth to cry loudly, Tho hen then sets to work to libérate it ; sho brings it forward under the feathers of the erop, and supporting it between the breastboue and the nest, begins tho work of setting it free. Sbe hitohes the point of her beak into tho hole formed by tüe raising of tho scalo by the chick's bcak, and breaks away the eggskin or shell all iround the greatost diameter of the cgg. The joint efforts of the hen without and the chick ■within then libérate the prisoner, and he struggles into existence, and gots dry under the feathers and the natural heat of tho hen. All female birds which sit on thoir eggs to hatch theni have the hook in tho beak strongly doveloped. Even the broad-billod duck and goose have those hooks especially developed.and with them they libérate their young. In Australia, whero everything soems to be by contrarios, it is the cock of the bush-tur-' key that hatches tho eggs, and not tho hen. It would be iuteresting to know whether tho hook of the beak is botter adapted for this service in the male bird than in the femalo. The hook of the beak of the ordinary cock of tho common fowl is quito different f rom that of the hen- it is adapted for wounding in iighting, but not for hatching of eggs.