Is sending plates for R. T. Lowe’s paper [Trans. Cambridge Philos. Soc. 4 (1833): 1–70].
Adds advice on working the surd.
Agrees with CD that Beagle voyage would have been wrong for Jenyns, but assures him he (CD) is the right man. Warns CD against his "foible" of taking offence at rudeness or ungentlemanlike behaviour.