Notices and Bibliography 
451 
Urban, F. M. The Application of Statistical Methods to the Problems of Psychophysics. 
Exper. Stud, in Psychol, and Pedagogy, iii. Philadelphia, 1908. Pp. ix + 221. 
Gives the detailed results of extensive experiments to determine the " threshold 
of difference " in the estimation of small weights. A considerable portion of the 
memoir is devoted to a general discussion of statistical theory, with particular refer- 
ence to psychophysical data. 
Variot, G. et LASSABLiiiRE, P. Sur I'inegalite de volume des glandes mammaires chez la 
femme. Consequences physiologiques. C. R. Acad. Sci. Paris, T. CXLVII, pp. 270 — 
272. 1908. 
Discussion based on 550 subjects. 
Yung, E. Des variations de la longueur de I'intestin chez la gi-enouille. C. R. Acad. Sci. 
Paris, T. CXLV, No. 25, pp. 1306—1309. 1907. 
CAMBEmGE: PRINTED BY JOHN CLAY, M.A. AT THE UNIVERSITY PKESS. 
