Since the article on Mesozoic Angiosperms was written, a very important Sketch History of “Pateobotany,” by Lester F. Ward, has appeared in the Fifth Annual Eeport of the U. S. Geol. Survey, a brief outline of which cannot fail to prove of interest in connexion with this subject. The object of the sketch is to collate and reduce the fragmentary and desultory mass of information collected by previous writers into a system that will enable geologists to use the testimony of fossil plants, in the same way that they habitually use that of fossil animals. The author laments that botanists and palaæobotanists have worked and classified almost wholly independently of each other, the former having consequently missed such important data for classification as the order in time in which each type appeared, while the latter have failed to harmonize their work with the more elaborate and best botanical systems, and hence greatly lessened its practical value. “Every candid palæobotanist must admit that he can understand fossil plants only as they resemble living ones, and that the botanist, studying the perfeet specimen with all its organs of reproduction as well as of nutrition, can alone declare with absolute certainty upon its identity or affinity.” This mutual dependence requires recognition at the hands of scientific men.