can be obtained, and thus the value of Z_{t°} for any required
temperature. The numbers calculated for gums all point to a diminution
in viscosity up to a certain point, and then a gradual increase. A
comparison of some of the figures actually obtained in some of these
experiments, compared with the calculated figures for the same
temperature, shows their general agreement.
[Illustration: Curves showing viscosity change with temperature for
three typical gums. A--Arabic VII. B--Senegal VIII. C--Ghatti 15.]