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Philadelphia - ADB is happy to contribute as best he can to the materials WW seeks for his book. He has made copies of the tracts on tides which accompanied WW's note, and intends to distribute copies 'to those who may aid by furnishing observations upon the plan which has been sketched'. ADB may be able to get the various tide observations 'kept irregularly and at different times, at places on the Atlantic coast of the United States'. Some of the gentlemen of the military service as well as men of science 'may be willing to observe systematically'.

Philadelphia - Letter of introduction for the Rev. President Wayland [Francis Wayland] of Brown University - who is visiting Europe 'for the examination of institutions for Collegiate education, with a view to the improvement of our own establishments of a similar grade'.

Washington - WW's letter of May 5 has arrived: 'When I received your former note on the subject of the tides I wrote at once to correct your misapprehension in reference to tidal observations in connection with the U.S. Coast Survey. I infer from your present note that my letter was not received'. ADB has done all he can to ensure his observations are valuable since taking charge of the Coast Survey in 1844: 'If I have not done all that was desirable I have done all that was then possible, and I appeal distinctly from the verdict which you have presumed without knowledge of the facts of the case, as to the tidal observations being without value!'