lii-. When a test 'boarcL is first installed at axxy given location, 

 the following infonaation shall he forwarded to the Clapp Lahoratories 

 and a carhon copy of letter sent to the Office of Kaval Eesearch, and 

 one to the cognizant Bureau or Agency. 



(a) Date when installed. 



(h) Depth of water. 



(c) Eange of tide. 



(d) Statement regarding degree of pollution. 



(e) Temperature of water. 



(f) Strength of cujrrent if it is known or can readily he 

 determined. 



15. When any changes in ahove data occur, they shall he noted in 

 suhsequent letters of transmittal accompanying panels sent to lahoratories . 



16. A copy of the letter of transmittal to Clapp Lahoratories shall 

 he forwarded to the Bureau each time panels are sent to the Lahoratory. 



ALIO Beferences 



Atwood, W. G. and Johnson/ A. A., Marine Structures, Their 

 Deterioration and Preserration . Report of the Commission 

 on Marine Piling Investigations. National Research Council, 

 Washington, D. C, '^^k pp., I69 text figs., Ik plates, I92I1. 



Bartsch, P., "A New Classification of the Shlpworms and Description 

 of Some New Wood-horing Mollusks," Proceedings of Biological 

 Society of Washington, Vol. 3k, pp. 25-52 (I921) . 



"Additions to Our Knowledge of Shipworms," Proceedings of 

 Biological Society of Washington, Vol. 56, pp. 95-102 (I925). 



"Stenomorph, a New Term in Taxonomy," Science, Vol. 57, p. 55O 

 (1925). 



Clapp, W. F., "A New Series of Teredo from Florida," Proceedings 

 of Boston Society of Natural History, Vol. 57, No. 2, 

 pp. 51-38, pi. 3-h (1925). 



Hill, C. L. and Kofoid, C. A. , Marine Borers and Their Relation 

 to Marine Construction on the Pacific Coast . San Francisco 

 Bay Marine Piling CGmmittee^ 557 PP.j 1^5 figs., I927. 



Jeffreys, J. G., "A Synoptical List of the British Species of 

 Teredo, With a Notice of Exotic Species," Ann. Magazine 

 of Natiiral History, ser. 5, Vol. 6, pp. 121-127 (i860). 



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