REFERENCES 



Under this heading it is proposed to include, by author, title, and citation, references to ail 

 scientific papers published in or emanating from Washington. It is requested that Puthors cooperate 

 with the editors by submitting titles promptly, following the style used below. These references are 

 not intended to replace the more extended abstracts published elsewhere in this Journal. 



ASTRONOMY 



Abbot, C. G., Fowlb, F. E., Aldrich, L. B. Confirmatory experiments on the 

 value of the solar constant of radiation. Proc. Nat. Acad. Sci., 1: 331-333. 

 1915. 



Becker, G. F. A possible origin of some spiral nebulae. Proc. Nat. Acad. Sci., 

 2: 1-8. 1916. 



Burton, H. E. and Watts, C. B. Observations of Comet 1913 f (Delavan). As- 

 tronomical Journal, 29: 172, No. 693. 1916. 



EiChelberger, W. S. The distances of the heavenly bodies. Journal Washing- 

 ton Academy of Sciences, 6: 161-175. 1916; Science, 43: 475-483. 1916. 



Hall, A., Burton, H. E., Watts, C. B., and Bower, E. C. Occultations of stars 

 by the moon. Astronomical Journal, 29: 128-132, No. 688. 1916. 



Hoogewerff, J. A. Actual time of signals from the U. S. Naval Observatory. 

 Published each month in Popular Astronomy. 1916. 



Littell, F. B. and Hill, G. A. Determination of difference of longitude be- 

 tween Washington and Paris, 1913-1914- Reprint of Publications of the 

 United States Naval Observatory, Second Series, vol. 9, Appendix. 1916. 



Peters, George H. Observations of asteroids with the photographic telescope. 

 Astronomical Journal, 29 : 147-148, No. 690. 1916. 



Ross, F. E. The Sun's mean longitude. Astronomical Journal, 29: 152-156, No. 

 691. 1916. 



Ross F. E. Investigations on the orbit of Mars. Astronomical Journal, 29: 157- 

 163, No. 692. 1916. 



ENGINEERING 



Marshall, R. B. Spirit leveling in Louisiana, 1903 to 1915, inclusive. U. S. 



Geological Survey Bulletin 634. Pp. 101, with one illustration. 1916. 

 Marshall, R. B. Primary traverse in Alabama and North Carolina, 1913-1915. 



U. S. Geological Survey Bulletin 644-A. Pp. 12, with one illustration. 1916. 

 Marshall, R. B. Triangulation in Arizona and New Mexico, 1913-1915. U. S. 



Geological Survey Bulletin 644-B. Pp. 24, with one illustration. 1916. 

 Marshall, R. B. Triangulation in California, 1913-1915. U. S. Geological 



Survey Bulletin 644-C. Pp. 84, with one illustration. 1916. 



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