5 1 MATHEMATICS 



5196 ERRORS OF OBSERVATION. 



5196 Brunt, D. The Combination of observations. 



Camb. 



5196 Czuber, E. Theorie der Beobachtungsfehler. 



Leip. 1891, 



5196 Lupton, S. Notes on observations. Lond. 1898. 



5198 Comstock, Q. C. Method of least squares. 



Boston, Mass. 1890. 



5198 Merriman, M. Method of least squares. 



New York 1901, 



