Note 530 — LETTER IX.
Reading edition
Small flies are sometimes found sticking to the glutinous stigma of some of the Orchideæ like birds on a limed twig: (Sprengel Entdecktes Geheimniss, 21—) and ants are not unfrequently detained in the milky juice which the touch of even their light feet causes to exude from the calyxes of the common garden lettuce. Ann. of Bot. ii. 590.