1. Traces of blood serum albumin have been demonstrated in normal milk.
2. The content of blood serum albumin is increased in many of the milks which are poor in non-fatty solids and there is evidence of some correlation between low non-fatty solids and high blood serum albumin content of the milk.
3. The experimental data support a conclusion that deficiency of nonfatty solids in milk in some cases may be due to dilution of a normal secretion in the udder by a fluid of the nature of oedema fluid, i.e. to a pathological rather than a physiological condition.
4. Some evidence, which obviously needs confirmation, has been adduced indicating that the casein-nitrogen content of milk as determined by Moir's technique may be slightly too high. The accuracy of the globulin figures seems also to be open to doubt.