Each log will have the bark left on.

It will be plainly marked in accordance with directions given under Detailed Instructions.
All material will be shipped to the laboratory immediately after being cut.

No trees will be cut until the collector is notified that the laboratory is ready to receive the material.
DETAILED INSTRUCTIONS _Part of Tree to be Tested_ (_a_) For determining the value of tree and locality and the influence on the mechanical properties of distance from the pith, a 4-foot bolt will be cut from the top end of each 16-foot butt log.
(_b_) For investigating the variation of properties with the height of timber in the tree, all the logs from one average tree will be used.
(_c_) For investigating the effect of drying the wood, the bolt next below that provided for in (_a_) will be used in the case of one tree from each locality.
_Marking and Grouping of Material_ The marking will be standard except as noted.

Each log will be considered a "piece." The piece numbers will be plainly marked upon the butt end of each log by the collector.

The north side of each log will also be marked.
When only one bolt from a tree is used it will be designated by the number of the log from which it is cut.