the behaviour of the serum towards cane sugar. To 1 c.c. of serum was added 1 c.c. of a 10 per cent. solution of cane sugar and 5 c.c. of normal salt solution. The initial rotation of the mixture was + 0.45°. At the end of the experiment the rotation had sunk to - 0.50° (see fig. 4).
(2) Blood was taken from a dog before the parenteral introduction of cane sugar. and the behaviour of
Fig. 4.
the serum towards this disaccharide was ascertained. Decomposition did not take place (curve 1 in fig. 5). Then 10 c.c. of a 5 per cent. solution of cane sugar were given to the animal by intravenous injection. The sample of blood, taken fifteen minutes after the injection, already showed hydrolysis of the cane sugar that had been added (curve 2 in fig. 5). For the purpose of control the rotation of the serum without the
