PI iacefoia l*niccrsity, A-r~a dc I scii XIXE FIGI'RES In previous papers it has been slio~vii tliat, untley specified conditions, the quantitative effects of teiiiperature, hydrostatic pressure, hydrogen ions, and various drugs, separateljand in relation to each other, on certain over-all hiological processes, such as bacterial luminesccnw, may ba analyzed with some success in the manner of less complicated chemical reactions (Johnson, Brown and Marsland, '42 ; Brown, Johnson and Xarsland, '42 ; Eyring and Magee, '42 ; Johnson, Epring and Vl'illiams, '42 ; Johnson, Eyring and I