PG’s article in Encyclopaedia Britannica wonderfully well done ["Insectivorous plants", 9th ed., 13: 134–40].
Admires PG’s researches on chlorophyll in animal kingdom ["Observations on the physiology and histology of Convoluta Schultzii", Proc. Roy. Soc. Lon. 28 (1878–9): 449–57].