1. After feeding, an increase in non-coagulable nitrogen of the serum can be determined, reaching a maximum in about six hours.

2. This increase is greatest in the portal blood and is partially due to an increase in amino-acids. There is no increase in proteoses.

3. There is usually a progressive decrease in serum protease, reaching a minimum after from five to seven hours.

4. The portal blood may show an unaltered or an increased amount of protease.

5. The serum antiferment shows a slight increase, but is subject to considerable fluctuation.

6. The serum lipase (esterase) shows a slight increase, reaching a maximum after three hours. The hepatic blood usually contains the lowest concentration of lipase.

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Copyright, 1915, by The Rockefeller Institute for Medical Research New York
1915
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