Note 373 — Chapter VII · THE FORMS OF TISSUES OR CELL-AGGREGATES

Origin of Species, ch. VIII (6th ed., p. 221). The cells of various bees, humble-bees and social wasps have been described and math­e­mat­i­cally investigated by K. Müllenhoff, Pflüger’s Archiv XXXII, p. 589, 1883; but his many interesting results are too complex to epitomise. For figures of various nests and combs see (e.g.) von Büttel-Reepen, Biol. Centralbl. XXXIII, pp. 4, 89, 129, 183, 1903.