Farina 370 collecting of 371 time of 372 confined to one species of flower on each journey 373 Reaumur's opinion _ib._ Dobbs, Butler and Sprengel's 373, 374 conveyance of 372 food of larvæ, and not the constituent of wax 371 fructifying power of 370 preparation of for use 371 source of 370 storing of 373 structure of 370 Fading 179 importance of 193 syrup for _ib._ modes of _ib._ times of 152 Fermentation, conduct of 240 Fertility of insects 32, 40 Flies in Madeira wine 201 Fly, flesh, erroneous judgement respecting 306 Food of larvæ 10 Fructification of flowers 380 instrumentality of bees to that end _ib._ bees attracted to flowers by their nectar _ib._ accused by Dr. Darwin of injuring flowers _ib._ defended by Dr. Evans _ib._ Opinion of Sir J. E. Smith 382 of Sprengel 383 not the only insects that promote fructification _ib._ in the Barberry for instance, the Iris Xiphium, the Aristolochia Sipho of America, the A. Clematitis, and the Date Palm _ib._