The oncotic pressure of this solution, calculated according to ADAIR (1928) and corrected for temperature (38" C) according t o WELLS et al. (1935), is 270 mm of water. The following formulas have been used: Oncotic pressure of the hemoglobin solution = __ -p (mm of H,o); V -B 100 ___. B = 2.54; p1 = p ; ; t* t and t,: K = 3700; V = Hb conc. in g per cent' absolute temperatures in degrees of C.