The glutamic acid and creatine content of cock seminal plasma.

reacting haemoglobin (Hb*) is formed. If pchloromercuribenzoate is added almost all the reduced haemoglobin formed is Hb*. At alkaline pH the chief product of photolysis is Hb* even in the absence of p-chloromercuribenzoate. 3. At alkaline pH Hb* reverts spontaneously to ordinary haemoglobin with a velocity constant of about 200 sec.-' at 10. 4. The second-order velocity constant for the combination of Hb* with carbon monoxide is 1-8 x 106M-1 sec.-' at 1° and the activation energy 5-6 kcal. 5. The bearing of these results on the use of flash photolysis in the study of haemoglobin kinetics is discussed.