We revisit the Glen Mhor stills to document exactly what we know about this area of the distillery using unearthed information and photographs. Then, thanks to a 1950 logbook entry about a faulty hydrometer, the Exciseman compares the new instrument versus the old one, across a series of 1939 warehouse casks. In doing so, he gives us the ability to record and document how efficiently maturation at Glen Mhor was, including any potential losses. End result, these warehouses were very efficient and effective.