Aids, or at least hints, to the coloration of extinct animals are to be found in the coloration of the young of various living species, for as the changes undergone by the embryo are in a measure an epitome of the changes undergone by a species during its evolution, so the brief color phases or markings of the young are considered to represent the ordinary coloring of distant ancestors. Young thrushes are spotted, young ostriches and grebes are irregularly striped, young lions are spotted, and in restoring the early horse, or Hyracothere, Professor Osborn had the animal represented as faintly striped, for the reason that zebras, the wild horses of to-day, are striped, and because the ass, which is a primitive type of horse, is striped over the shoulders, these being hints that the earlier horse-like forms were also striped. Thus just as the skeleton of a Dinosaur may be a composite structure, made up of the bones of a dozen individuals, and these in turn mosaics of many fragments, so may the semblance of the living animal be based on a fact, pieced out with a probability and completed by a bit of theory. _REFERENCES_ _There is a large series of restorations of extinct animals, prepared by Mr. Charles R. Knight, under the direction of Professor Osborn, in the Hall of Palaeontology of the American Museum of Natural History, and these are later to be reproduced and issued in portfolio form._ _Should the reader visit Princeton, he may see in the museum there a number of B. Waterhouse Hawkins's creations--creations is the proper word--which are of interest as examples of the early work in this line._ _The "Report of the Smithsonian Institution for 1900" contains an article on "The Restoration of Extinct Animals," pages 479-492, which includes a number of plates showing the progress that has been made in this direction._ [Illustration: Fig. 27.--A Hint of Buried Treasures.] VIII FEATHERED GIANTS _"There were giants in the earth in those days."_