ii' TABLE OF CONTEXTS. 



BOTANY. By "W. G. Farlow, M.D clxxv 



AGRICULTURE AND RURAL ECONOMY. By Prof. W. O. Atwatek. clxxxi 



INDUSTRL\L STATISTICS. By Wm. H. Wahl cxciv 



INDEX TO SUMMARY ccxxxi 



PAET 11. 



ABSTRACTS OF SCIENTIFIC A\D HDUSTRIAL ARTICLES.^- 



A. MATHEMATICS AND ASTRONOMY (xvii) 1 



(a.) MATHEMATICS. 



On the Cissoid of Diodes, 1 ; Theorem in the Equilibrium of Forces, 2 ; 

 the Value of the Dozen, 2 ; the Law of Reciprocity of Prime Numbers, 3 ; 

 Hyperbolic Functions, 4 ; Curious Curves and Equations. 4 ; List of Loga- 

 rithmic Tables, 43; Calculating Machines, 43; Somoff's Barycentric Theo- 

 rem, 54. 



(b.) ASTRONOMY. 



Interstellar Space : The Resisting Medium Existing in Space, 49. The 

 Nebulae : Vogel's Positions of Clusters and Nebulas, 15 ; Supposed Changes 

 in the Omega Nebula, 16 ; on the Spectra of the Nebulae, 26 ; Exact Ob- 

 servations of Nebulae, 50. The Stars : The Rugby (Temple Observatory) 

 and Mr. Gledhill's Catalogues of Double Stars, 17 ; on the Orbit of the 

 Double Star Sigma 634, 18 ; the Companion of Sirius, 18 ; the Variable Star 

 Beta Persei (Algol), 19 ; Proper Motions of Southern Stars, 22 ; Colors of 

 Double Stars, 17; Orbit of the Binary Star Gamma Coronae Australis, 22; 

 Orbit of the Binary Star 70 (p) Ophiuchi, 23; the Double Star Beta Lepo- 

 ris, 23; on a Classification of Double Stars, 24; on the Double Star 61 

 Cygni, 24; an Ancient Discovery of a Variable Star, 81 : on the Parallax 

 of 1830 Groombridge. 32 ; Special Treatise on Double Stars, 44 ; the Third 

 RadcliflTe Catalogue of Stars, 45 ; Cincinnati Catalogue of New Double Stars, 

 47; Spectrum Observations of the Stars, 48; Fundamental Stars Observed 

 at Harvard College Observatory, 53 ; Variable Stars v, w, and x Sagittarii, 

 54. The Solar System: The Motion of Stars to or from the Earth, 19; 

 Motion of the Solar System in Space, 49. The Sun : Correlation of Solar 

 and Terrestrial Phenomena, 8 ; Conflicting Views of Secchi and Langley in 

 Regard to the Sun, 9; on an Ancient Eclipse of the Sun, 10; Total Solar 

 Eclipse of December 11, 1871, 11 ; the Solar Eclipse of April 16, 1874, 58; 



* In the arrangement of articles in the body of the Record, it was found impracti- 

 cable to place them in proper systematic sequence, especially as many belonged as 

 much to one division as to another, sometimes even to three or four equally. The 

 present systematic Table is intended to remedy the difficult}-, by bringing together in 

 proper order all the titles of articles, and, by a system of cross references and dupli- 

 cations, to point out all matter relating to any one subject, whatever be its situation 

 in the volume. The references in Eoman letters preceding the page references of the 

 headings relate to the pages of the introductory "Summary."' 



