Heat effects and densities of hen egg lysozyme in the phosphate buffer at pH 8.8 and various NaCl concentrations were determined
at 25°C by LKB 10700-2 microcalorimeter and an Anton Paar 60/602 densimeter. The relation between the changes of the enthalpy
and apparent molar volumes vs. molality of NaCl were determined. The data are discussed together with the data obtained previously for hen egg lysozyme
solutions with NaCl salt in Na-acetate buffer pH 4.2.