1. In thyroparathyroidectomized dogs the onset of tetany bears no constant relation to the ferment-antiferment balance of the serum.

2. The serum lipase titer remains at a low level throughout.

3. A progressive increase in non-coagulable nitrogen and proteoses is observed in the serum following the removal of the glands.

4. The amino nitrogen of the serum is usually increased at the time when tetany is most marked.

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