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1The Department of Biochemistry, The University of Toronto
1
The names oestrone and oestriol are here used to designate the two oestrogenic substances present in human pregnancy urine which have been known previously as ketohydroxyoestrin and trihydroxyoestrin, theelin and theelol, etc. This new system of nomenclature has been approved by the majority of the interested English workers [Nature, 1933, 132, 205]. The name oestrin is used where it is desired to refer to the oestrogenic material in urine without specifying its exact chemical nature.