(3) Ihe particles formed under conditions of item (2) undergo 9, spontaneous 

 change during the first tvro hours or so accompanied by a decrease in 

 average pH value (true solution, plus suspended i:-articles) to an 

 equilibrium condition intermediate to that of the original solution 

 and the maximum pH attained on the addition of the hydroxide. 



(h) The initially precipitated ferrous material is much more readily 

 oxidized than the alteration product described in item (3). 



iS) The concentration of the hydrogen and/or hydro:!Qrl ions has an. 



important influence on the type of oxide formed from a ferrous salt, 

 magnetite being favored in basic solutions, /-•^ferric oxide mono- 

 hydrate in solutions near the neutral point, and ■; -ferric oxide 

 monohydrate in more acid solutions. 



The natural resins in southern yellow piije have been found to interfere 

 with the formation of sovre compounds, /;> '-ferric oxide was apparently 

 not formed at all and the conversion of the hydrous gel to the anhydrous 

 C -ferric oxide was doubtful. Similarly, it is believed that copper 

 sulfide may not be very efficiently formed in the wood through interaction 

 of copper sulfate and sodium thiosulfate when heat treated. 



ACKNO /LEDGIKNT 



The authors are indebted to Mr. '. L. Starr and ivlr. A. I, Funai for the 

 extensive X-ray diffraction analyses made in these studies. 



1. KcKennis, H., "Treatment of bod V/ith Aqueous Solutions," Naval 

 Civil bn^ineering Laboratory Tech. Report OOh, October 28, 19^9. 



2. Maclean, J. D., "Results of Experiments on the Effectiveness of 

 Various Preservatives in Protecting bod Against Marine Borer 

 Attack," Forest Products Laboratory, No. D1773, June 1950. 



3. Smith, f'. G. .'alton, iiarine Corer Project, Semi-Annual Progress 

 Report, submitted by the M.arine Laboratory, University of Miami, 

 to The Office of Naval Research, pp 7-8, July 195l« 



h. Sverdrup, "\ U., Johnson, M. ., and Fleming, R. H., "The Oceans," 

 pp I9I4-5, New York, Prentice-Hall, Inc., 19li6. 



5. Fricke, R., and Zerrxveck, /., Z. Elektrochem. 13, 52 (1937). 



6. Weiser, H. B., and Milligan, '. 0., J. Phys. Chem., 39, 2$ (1935)'. 



7. Winchell^ A. II., and inchell, H., "Elements of Optical Mineralogy," 

 p 76, Nevf York, John ./iley k Sons, Inc., 1951. 



8. Baudisch, 0., and Albrecht, W. H., J. Am. Chem. Soc, $h, 9h3 (1932). 



K - 9 



