We hardly wish to collect any more large Dinosaurs form this formation unless of very unusual interest and easy to get; but we do wish to know more of the vegetation and other animal life of the time, as in studying these seemingly"unaccountable beasts"  we wish to know where and how they lived and what was their food and habitat.  If such brutes have any excuse for living it would be a good plan to find out what it was if possible.  Prof. Marsh found, in Wyoming, a locality in which there were jaws and teeth of mammals.  To find bones or skeletons of mammals in this formation, or in any up to Teritary, would undoubtely be one of the great trimphs of this age of discoveries.