Sends a copy of the printed paper by RF. Regarding chronometer measurements. Has just received a communication from Alexander von Humboldt in which he seems to have anticipated both JH's and RF's ideas. Comments on a new machine for sounding.

A defence of the work of missionaries in the Pacific islands and Australia. [The letter was apparently written by RF with supporting evidence quoted from CD’s journal. The letter is signed by RF alone. A summary conclusion, as printed, is signed by both:] "On the whole, balancing all that we have heard, and all that we ourselves have seen concerning the missionaries in the Pacific, we are very much satisfied that they thoroughly deserve the warmest support, not only of individuals, but of the British Government."