Miscellaneous Intelligence. 



445 



On the History and Theory of the instruments known as rotascopes, gyroscopes, 

 etc. ; by W. B. Rogers. 



On Various Cyclones or Typhoons of the North Pacific Ocean, with a chart show- 

 ing their course of progression ; By W. C. Redfield. 



On the Modifications of the Sesquioxyd of Chromium ; by E. N. Horsford. 



On the Relative Age of the different portions of the moon's surface, and the catas- 

 trophe to which a large portion seems to have been subjected ; by Stephen Alexander. 



On a New Method of measuring celestial arcs ; by Alvan Clark. 



Approximate cotidal lines of diurnal and semidiurnal tides of the Coast of the 

 United States on the Gulf of Mexico ; by A. D. Bache. 



A Report on the New Methods of Observation now in use at the Cincinnati Obser- 

 vatory; by 0. M. Mitchell, viz: 



1. New Method of right ascension, as to its limit of accuracy. 



2. New Method of declination, as to its limit of accuracy. 



3. New Method of determining personal equation and personal error. 



4. New Method of determining instrumental errors. 



5. New Method of determining clock errors. 



6. Observations on changes of figure of materials. 



Morphological discussion of the laws of central forces; by Benjamin Peirce. 

 Further Investigation relative to the form, the magnitude, the mass, and the orbit 

 of the asteroid planets ; by Stephen Alexander. 

 On the Heat in the Sun's rays ; by Elisha Foote. 

 On the Heat in the Sun's rays ; by Eunice Foote. 

 Tidal Currents of Saturn's Ring ; by Benjamin Peirce. 

 Remarks on Ozone observations; by W. B. Rogers. 



On the Meridian Instruments of the Dudley Observatory; by B. A. Gould. 



On some Special Arrangements of the Solar System, which seem to confirm the 

 nebular hypothesis ; by Stephen Alexander. 



Notice of Observations to determine the cause of the increase of Sandy Hook, 

 made by the Coast Survey, for the Commissioners on harbor encroachments of New 

 York ; by A. D. Bache. 



On the Advantage of observing a lunar spot instead of a limb, in transits, for de- 

 termining the difference of longitude ; by Dr. Peters. 



Supplement to the Paper published in the Providence Proceedings, on the secular 

 variation in magnetic declination in the Atlantic and Gulf Coast of the United 

 States, from observations in the 17th, 18th, 19th centuries, under permission of the 

 Superintendent ; by Charles A. Schott. 



Discussion of the Secular variation of magnetic inclination in the Northeastern 

 States, communicated under permission of the Superintendent and authority of the 

 Treasury department ; by Charles A. Schott. 



Discussion of the terrestrial magnetic elements for the United States, from obser- 

 vations in the Coast Survey and others ; by A. D. Bache and J. E. Hilgard. 



On Temporary Stars, and the spheroidal origin of the forms of clusters and 

 nebulae; by Stephen Alexander. 



On the formation of air bubbles by drops falling on the surface of water, etc.; 

 by William B. Rogers. 



On the Results of the United States Astronomical Expedition to Chili, for the 

 determination of the solar parallax ; by B. A. Gould, Jr. 



An Account of a large barometer in the Hall of the Smithsonian Institution; by 

 Joseph Henry. 



On a Method of determining the latitude of a place, from the observed times 

 when two known stars arrive at the same altitude; by W. Chauvenet. 



On the Plan of Reduction of the Meteorological Observations reported to the 

 Smithsonian Institution, adopted by the Secretary ; by James H. Coffin. 



On Tables of the Asteroids; by Dr. Briinnow. 



Tables of Prussian Mortality, interpolated for annual intervals of age ; accompa- 

 nied with formula? and process for construction ; by E. B. Elliott. 



Process for deducing accurate average duration of life, present values of life annu- 

 ities, and other useful ta,bles involving life contingencies from returns of population 

 and deaths, zoithout the intervention of a general interpolation ; by E. B. Elliott. 



On the Increase of Accuracy in the mean result, by augmenting the number of 

 observations ; by Dr. Peters. 



