85 



infested or subject to infestation ; if an untreated structure is built to serve temporarii\- 

 it should be completely removed as soon as possible. Similarly driftwood and unused 

 or aliandoned timber of every description should be removed. 



Borer attack thus can be greatly reduced and infestation often rendered negligible 

 and perhaps eliminated, by the general adoption of protected types of piling and by a 

 thorough program of marine sanitation. 



Records 



The problems involved in marine structures must largely be solved by indi\idual 

 owners for their individual conditions. Knowledge of the subject is in a state of 

 development and will continue to be so for a considerable time. The particular nature 

 of the problem involves study and investigation covering many years, often a period 

 longer than that in which the organization of the original builders remains intact. 

 For this reason, records of essential details and conditions should be established and 

 maintained in order that past procedures may be judged as a basis for future work. 

 Kniiwleilge of probable life and cost is essential for an intelligent selection of materials. 

 The only means by which such information can be developed is through records of 

 indi\-idual concerns. A majority of structures are modified and rearranged in the course 

 of time, and all such work can be greatly simplified if general data have been kept 

 on them. 



