522 Miscellaneous Intelligence. 



A. S. Packard: Further studies on the brain of Limulus Polyphemus. 



S. P. Laxgley : On aerodromics. 



F. H. Bigelow : The Solar Corona, an instance of the Newtonian potential in 

 the case of repulsion. 



J. S. Billings : Report on the human hones of the Hemingway collection in 

 the U. S. Army Medical Museum, prepared by Dr. Washington Matthews, 

 U. S. A. 



A. A. Michelsov: Application of interference methods to spectroscopic meas- 

 urements. 



H. S. Pritchett: The Corona from photographs of the eclipse of Jan. 1, 1889. 



Lewis Boss : Stellar motion problems. 



Ira Remsex: Effect of pressure and temperature on the decomposition of 

 diazo-compounds. Researches on the double halides. 



M. Carey Lea: Allotropic silver ; note on a paper by M. G. Lippmann. 



H. A. Rowland: On the yttrium earths, and a method of making pure 

 yttrium. 



E. D. Cope: On the distribution of colors in certain North American reptiles. 



Theo. Gill: The taxonomy of the apodal fishes. 



W. K Brooks and E. G. Coxklix: Researches on the embryology of mollusks. 



Report of the Watson Trustees, and Presentation of the Watson Medal to 

 Prof. Arthur Auwers of Berlin. 



5. Magnetite Ore Districts of Brazil — Erratum. — Dr. O. A. 

 Derby informs the Editors that the mineral occurring with the 

 magnetite at Ipanema and referred to on page 316 of the April 

 number as enstatite, has proved on further examination of better 

 material to be barite. One specimen shows free crystals of 

 barite upon its surface. 



Examen Quimico y Bacteriologico de las Aguas Potables por A. E. Salazar y 

 C Newman ; con un capitulo del Dr. Rafael Blanchard. 513 pp. 8vo, with seven 

 plates. London, 1890. 



Lecons sur les Metaux, Professees a la Faculte des Sciences de Paris, par 

 Alfred Ditte. Professeur de Chimie a la Faculte. Premier Fascicule, Paris, 1891. 



The number system of Algebra treated theoretically and historically by Henry 

 B. Fine, Ph.D. 131 pp. 12mo. Boston and New York, 1891. 



Report of the Superintendent of the U. S. Coast and Geodetic Survey for the 

 year ending June, 1888, pp. 566. 4to, Washington, 1889. 



Determinations of Latitude and Gravity for the Hawaiian Government, by E. D. 

 Preston, pp. 563. 4to, Washington, 1890. (United States Coast and Geodetic- 

 Survey. Appendix 14.) 



The International Astrophotographic Congress and a Visit to Certain European 

 Observations and other Institutions, by Albert G. Winterhalter, pp. 354. 4to, 

 Washington, 1889. (Washington Observations. 1885, Appendix I.) 



Magnetic Observations at the United States Naval Observatory, 1888 and 1889, 

 by Ensign J. A. Hoogewerff, U. S. Navy, pp. 100. 4to, Washington, 1890 r 

 (Washington Observations. 1886, Appendix I.) 



Saturn and its Ring, 1875-1889, by Asaph Hall, Prof, of Mathematics, U. S. 

 Navy. pp. 22. 4to, Washington, 1889. (Washington Observations, 1885, Ap- 

 pendix II.) 



Brachiopoden der Alpinen Trias von A. Bittner, pp. 325. 4to, Wien, 1890. 

 (Alfred Holder, Vienna Academy.) 



