Abstract
This work was undertaken to test Arakawa's reaction of different portions of human milk fed at one time. Milk was obtained in each case just before feeding and then at the interval of each minute during the one feeding. It was very difficult to collect a larger number of such cases, because many an infant, who got very angry and wanted to drink no more milk, made it impossible to continue the work in that special case. But I was able to investigate the reaction as long as about 5 or 6 minutes in 13 cases.
And the result was that the reaction of different milk portions was tolerably constant, so that the fraction obtained before feeding as well as during feeding would, as regards Arakawa's reaction, be considered as representing the whole milk fed at the time (Cf. Figure).
