758 Scientific News. [ December. 
nished with Hartnack objectives. Besides the manufaeture of stands, 
Mr. Schrauer gives special attention to repairing microscopes and other 
scientific instruments. He also makes the common accessories, includ- 
ing the binocular attachment. 
EITR’S Heriostat. — A new heliostat, designed by Professor 
Ta is now made by Edward Kubel, of 326 First Street, Washington, 
D. C. It is an excellent model, simplified without loss of efficiency, and 
no doubt the best instrument for the use of microscopists who require 
direct sunlight, for photography, blue-cell work, or any other purpose. 
It seems a full substitute for the expensive imported instruments. Its 
cost is $50.00. 
PROCEEDINGS OF SOCIETIES. 
$ 
AMERICAN JOURNAL OF SCIENCE AND ARTS. — November. Intro- 
duction and Succession of Vertebrate Life in America, by O. C. Marsh. 
Note on the Helderberg Formation of Bernardston, Massachusetts, and 
Vernon, Vermont, by J. D. Dana.’ Is the Existence of Growth-Rings in 
the early Exogenous Plants Proof of Alternating Seasons? by C. B. 
Warring. (The foreign journals were not received in time to be noticed.) 
Boston Society or Natura History. — October 17th. .Mr. C. 
S. Minot made a communication on the Unity of all Forms of Muscular 
Contraction. 
November 7th. Professor C. Semper addressed the members on a 
Land Mollusk from the Philippines ; Onchidium, and its Dorsal Eyes. 
New York Acapemy or. Scrences.— November 5th. A paper 
was read by Mr. A. A. Julien, entitled Observations on the Geognosy 
of North Carolina. 
AMERICAN GEOGRAPHICAL Society. — November 8th. Rev. Selab 
Merrill delivered a discourse upon Modern Researches in Palestine. 
SCIENTIFIC NEWS. 
Important Notice TO SUBSCRIBERS. — The American NATURAL- 
1st will hereafter be published by Messrs.. McCalla & Stavely, Philadel- 
phia, Pa., and will be edited by A. S. Packard, Jr., and Prof. E. D. 
Cope, with the assistance of eminent men of science. The January 
number, with an unusually attractive table of contents, will be sent out 
to past subscribers, and it is earnestly hoped that all will not only renew — 
their subscriptions, but induce others to subscribe. A little effort on 
the part of the friends of science will now insure the prosperity of this 
useful and attractive journal. : 
_ Errata. — Page 72, for Glivieri read Olivieri. Page 122, for Peruvian read Per- 
Mian. Page 603, fifth line from bottom, for carpus read tarsus. 
é 
