Certain trees are felled and cut into small logs of varying lengths between 3 to 6 feet and carried in this form, although each shipment should contain logs of a similar size. Like pit-props, pulpwood can be measured in cubic fathoms and, because of its destined use, it is cleaned as much as possible before shipment – all bark being stripped. Thereafter the cargo must be kept strictly clean during its passage to the paper mills.