Permanent Elements in the Flux of Present-day Physics.

The Am.erican Association for the Advancement of Scientific Apparatus and Laboratory Methods: Sciene: An Electric Kymograph: DR. W. T. PORTER, C. E. Permanent Elements in the Flux of Present-day Roy and A. ViANEY .............. . 41 Physics: PROFESSOR P. W. BRiDGMAN .............................. 19 The Mutual Influence of Organic Compounds in the Special Articles: Animal Body: PROFESSOR F. KNOOP ... ......... 23 A Possiba e Relati on between Natural (Earth) Radiation and Gene Muxtation: PROFESSOR FRANK Scientfic Names: PROFESSOR JAMES G. NEEDHAM 26 BLAIR HANSON and FLORENCE HEYS. The Effect Soientific Events: of Varying the Duration of X-ray Treatment Engineers in American Life; Dental Council on upon the Frequency of Mutatin: C. P. OLIVER. Materia Medica and Therapeutics; Gold Medals of Ovarian Changes during Pregnancy in the Rat: the Massachusetts Horticultural Society; PresenDR. OLIVE SWEzy and PROFESSOR HERBERT M. tation to Professor Novy; The George Herbert EVANS ... .......... ....._. 43 Jones Chemical Laboratory of the University of Chicago ..... ...............28 Soience News .... . .x