The blood findings in five monkeys after experimental high intestinal obstruction are reported.

All animals showed the marked rise in non-protein nitrogen characteristic of intestinal obstruction in man and the dog.

Two monkeys showed a very marked drop in chlorides, the others a less marked fall. Coincident with the change in chlorides there is a rise in the CO2-combining power.

The uric acid and creatinine showed no typical changes.

No vomiting was observed. This emphasizes the fact that vomiting alone does not account for the fall in blood chlorides characteristic of intestinal obstruction.

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