Frederick Banting realized that this procedure would destroy the trypsin-secreting cells but not the insulin. Once the trypsin-secreting cells had died, insulin could be extracted from the islets of Langerhans. Banting discussed this approach with J. J. R. Macleod, Professor of Physiology at the University of Toronto. Macleod provided experimental facilities and the assistance of one of his students, Charles Best. Banting and Best, with the assistance of biochemist James Collip, began the production of insulin by this means. As the experiments proceeded, the required quantities could no longer be obtained by performing surgery on living dogs. In November 1921, Banting hit
Highest and best use both "as improved" and "as if vacant". Vacant properties are generally only given the "as vacant" test. The Highest and Best Use as vacant may be the same or different as the Highest and Best use as improved. For improved properties, the first analysis applied is the use of the property based on the assumption that the parcel is vacant. Then, the analysis focuses on the use that should be made of the property as it is currently improved. The extent to which the existing improvements differ from the highest and best use as-if vacant, reveals the extent of any