Fortunately the idea is not hard to grasp. Conservation is really but doing unto others as we would that others should do unto us--so living that other life also may have a fair chance. It was a child who wrote, from her understanding heart:-- "When I do have hungry feels I feel the hungry feels the birds must be having. So I do have comes to tie things on the trees for them. Some have likes for different things. Little gray one of the black cap has likes for suet. And other folks has likes for other things."--From _The Story of Opal._ CHICK, D.D. _Penthestes atricapillus_ is the name men have given the bird who calls himself the "Chickadee." _The Bird_ (Beebe), page 186. "The next time you see a wee chickadee, calling contentedly and happily while the air makes you shiver from head to foot, think of the hard-shelled frozen insects passing down his throat, the icy air entering lungs and air-sacs, and ponder a moment on the wondrous little laboratory concealed in his mite of a body, which his wings bear up with so little effort, which his tiny legs support, now hopping along a branch, now suspended from some wormy twig. "Can we do aught but silently marvel at this alchemy? A little bundle of muscle and blood, which in this freezing weather can transmute frozen beetles and zero air into a happy, cheery little Black-capped Chickadee, as he names himself, whose trustfulness warms our hearts! "And the next time you raise your gun to needlessly take a feathered life, think of the marvellous little engine which your lead will stifle forever; lower your weapon and look into the clear bright eyes of the bird whose body equals yours in physical perfection, and whose tiny brain can generate a sympathy, a love for its mate, which in sincerity and unselfishness suffers little when compared with human affection." _Bird Studies with a Camera_ (Chapman), pages 47-61. _Handbook of Nature-Study_ (Comstock), pages 66-68. _Nature Songs and Stories_ (Creighton), pages 3-5. _American Birds_ (Finley), pages 15-22. _Winter_ (Sharp), chapter VI. _Educational Leaflet No. 61._ (National Association of Audubon Societies.) This story was first published in the _Progressive Teacher_, December, 1920. THE FIVE WORLDS OF LARIE _Larus argentatus_, the Herring Gull. Larie's "policeman," like Ardea's "soldier," is usually called a "warden." No thoughtful or informed person can look upon "bird study" as merely a pleasant pastime for children and a harmless fad for the outdoor man and woman. It is a matter that touches, not only the aesthetic, but the economic welfare of the country: a matter that has concern for legislators and presidents as well as for naturalists. In this connection it is helpful to read some such discussion as is given in the first four references. _Bird Study Book_ (Pearson), pages 101-213; 200. _Birds in their Relation to Man_ (Weed and Dearborn), pages 255-330. _Bird-Lore_, vol. 22, pages 376-380.