“The unit adopted for insulin shall be approximately one-fifth that of the original Toronto unit, which is the amount of insulin required to lower the blood sugar of a 2 kg. rabbit to 0.045% within four hours, and caused symptoms

The small unit would be more practical in cases were small amounts of insulin would have to be prescribed. By using the original (Toronto) unit, fractions would have to be prescribed, and this would be undesirable.”

(IC-UT, December 1922)