INDEX TO CONTRIBUTORS. 49 



PAGE 



62. Our present knowledge of the planet Jupiter. 

 66. Waves, molecules, and atoms. 



90. Communicates resolutions in memory of G. C. Scbaeffer. 



Dr. W. Thomson (of New York City). [of eye, 



22. New method for detecting and measuring optical defects 



J. M. Toner. 



97. A method of locating geographical regions. 



Capt. TuPMAN (of London), 



56. Observations made on a solar eclipse. 



Prof. J, Tyndall (of London). 



65. Remarks on abnormal phenomena of sound, 



91, Fog signals. 



Dr. Van Sant (of San Francisco), 



56. A new method of lighting gas jets. 



Prof. J. C. Watson (of Ann Arbor). 



53. The discovery of new planets. 



A. J. WOEIKOFP. 



75. Meteorology in Russia. 



J. J. Woodward. 



24. An alleged hermaphrodite. [form. 



4L Desirability of reproducing photographs in a permanent 

 47. The use of monochromatic sunlight. 



57. Communicates letter from Dr. B. A. Gould, of Cordoba. 

 57. The Woodbury photo-relief process. 



88. Communicates letter from Dr. B. A. Gould, of Cordoba. 



89. Exhibits the spectra of certain metals and gases. 

 93. Communicates a letter from Dr. Jackson, of Boston. 



93. Micrometric writing on glass. 



94. Communicates a letter from Mr. Ramsey. 



M. Yarnall. 



74. A general star catalogue. 



