CONTENTS 
Page 
Physics. — ^Note on the Self-Adjusteng Interferometer in Relation to the 
AcHROMATiQ FRINGES By Carl Barus 53 
Pathology. — Comparison of White and Colored Troops in Respect to Incidence 
OF Disease By Lt.-Col. A. G. Love and Maj. C. B. Davenport 58 
Astronomy. — Perturbations and Tables of the Minor Planets Discovered by 
James C. Watson By Armm O. Leuschner 67 
Pathology. — Congenital Art^rio-Venous and Lymphatico-Venous Fistulae. 
Unique Clinical and Experimental Observations By William S. Halsted 76 
Mathematics. — ^Tables of the Zonal Spherical Harmonic of the Second Kind 
Qi(s) AND Qi'(z) By A. G. Webster and Willard Fisher 79 
Statistics. — On the Mean Age at Death of Centenarians. . . .By Raymond Pearl 83 
Report of the Autumn Meeting. — Prepared by the Acting Home Secretary ... 87 
National Research Council. — Minutes of the Meeting of the Executive Board 91 
