_DAYS OUT OF DOORS._ By CHARLES C. ABBOTT. 12mo. Cloth, $1.50. “‘Days out of Doors’ is a series of sketches of animal life by Charles C. Abbott, a naturalist whose graceful writings have entertained and instructed the public before now. The essays and narratives in this book are grouped in twelve chapters, named after the months of the year. Under ‘January’ the author talks of squirrels, muskrats, water-snakes, and the predatory animals that withstand the rigor of winter; under ‘February’ of frogs and herons, crows and blackbirds; under ‘March’ of gulls and fishes and foxy sparrows; and so on appropriately, instructively, and divertingly through the whole twelve.”—_New York Sun._ _THE PLAYTIME NATURALIST._ By Dr. J. E. TAYLOR, F.L.S., editor of “Science Gossip.” With 366 Illustrations. 12mo. Cloth, $1.50. “The work contains abundant evidence of the author’s knowledge and enthusiasm, and any boy who may read it carefully is sure to find something to attract him. The style is clear and lively, and there are many good illustrations.”—_Nature._ _THE ORIGIN OF FLORAL STRUCTURES through Insects and other Agencies._ By the Rev. GEORGE HENSLOW, Professor of Botany, Queen’s College. With numerous Illustrations. 12mo. Cloth, $1.75. “Much has been written on the structure of flowers, and it might seem almost superfluous to attempt to say anything more on the subject, but it is only within the last few years that a new literature has sprung up, in which the authors have described their observations and given their interpretations of the uses of floral mechanisms, more especially in connection with the processes of fertilization.”—_From Introduction._ _THE GARDEN’S STORY; or, Pleasures and Trials of an Amateur Gardener._ By GEORGE H. ELLWANGER. With Head and Tail Pieces by Rhead. 12mo. Cloth, extra, $1.50. “Mr. Ellwanger’s instinct rarely errs in matters of taste. He writes out of the fullness of experimental knowledge, but his knowledge differs from that of many a trained cultivator in that his skill in garden practice is guided by a refined æsthetic sensibility, and his appreciation of what is beautiful in nature is healthy, hearty, and catholic. His record of the garden year, as we have said, begins with the earliest violet, and it follows the season through until the witch-hazel is blossoming on the border of the wintry woods.... This little book can not fail to give pleasure to all who take a genuine interest in rural life.”—_New York Tribune._ _THE ORIGIN OF CULTIVATED PLANTS._ By ALPHONSE DE CANDOLLE. 12mo. Cloth, $2.00.