The Estimation of Proteins by the Precipitation Reaction

1. The amount of crystallisable albumin in egg-white and the amount of total globulin in horse serum have been estimated by means of the precipitation reaction. The results are in good agreement with those obtained by other methods. 2. For such estimations it appears advisable to use only antisera prepared against individual proteins. 3. A description of the manufacture and the characteristics of the pure proteins used is appended.