Has rewritten paper on leaf arrangement after criticism by Royal Society referees. Has found new factor influencing leaf arrangement, i.e., spontaneous variability in the number of vertical leaf-ranks.

On his new paper for Royal Society on a point of leaf arrangement. Asks CD to communicate it and "gives some details of its contents", e.g., recorded observations of changing leaf-order on individual specimens.

Comments on a paper by George Henslow ["Helianthus tuberosus", Trans. Linn. Soc. Lond. 26 (1876): 647].