ANNOUNCEMENTS. 
15 
introduced plants which have become well established. It promises to be 
an important addition to the botanical literature of the County. 
We take pleasure in announcing the “New American Monthly Micro¬ 
scopical Journal,” which, as its prospectus states, is a continuation of the 
Quarterly. We need a magazine devoted to Microscopical Science in this 
country, and we think every Microscopist should feel himself called upon 
to take a personal interest in an enterprise, which is to prove of so much 
benefit to them. The scope of the Monthly, as given in the prospectus, 
covers the ground thoroughly and, we think, leaves little to be desired. 
The forthcoming volume of the Proceedings of the American Associ¬ 
ation for the Advancement of Science contains a number of valuable 
papers, among which may be mentioned,—History and Methods of Palaeon¬ 
tological Discovery by Prof. O. C. Marsh. The author gives in a clear, 
concise manner, the history of the science from its conception, dividing 
the subject into four periods; from the crude impressions of the ancients 
to the learned reasonings of the modern scientist. A very valuable con¬ 
tribution. 
Observations of the Transit of Mercury, May 6, 1878, including a 
Systematic Search for a Satellite, and Measures of the Diameter of the 
Planet. By D. P. Todd, Washington, D. C. 
A paper on the Observations of Double Stars. By Asaph Hall, Wash¬ 
ington, D. C. 
The Twelfth Annual Report of the Peabody Museum of Archmology and 
Ethnology, Cambridge, 1879, presents some important articles on archae¬ 
ology and kindred subjects, and promises, we think, to be quite an attrac¬ 
tive volume. 
Ad. F. Bandelier writes a very exhaustive paper on the Social Organi¬ 
zation and Mode of Government of the Ancient Mexicans. The author 
gives copious notes and quotations from distinguished authorities, making 
the contribution a most important work of reference. 
Paul Schomacher invites our attention to the Method of Manufacturing 
Pottery and Baskets among the Indians of Southern California. 
Elmer R. Reynolds contributes a paper on Aboriginal Soapstone 
Quarries of the District of Columbia. 
Hon. Lewis II. Morgan is the author of an article entitled “The Ruins 
of a Stone Pueblo on the Animas River in New Mexico.” 
