The Audion —Its Action and Some Recent Applications,” Franklin Inst. (May and June 1923); Faber and Gram, Arch. Int. Afed., vol. 34, p. 827 (1924); Ivy and Farrell, Proc. Am. Physiol. Soc. (Dec. 1925); Kahn and Torrey, Jour. Inf. Dis., vol. 37, P- 43, 1921). Theories of Culture-—Robertson Smith is undoubt- edly the spiritual side