With the pollinia of orchids, the threads which originally served to tie together the pollen-grains, can be traced cohering into caudicles; and the steps can likewise be followed by which viscid matter, such as that secreted by the stigmas of ordinary flowers, and still subserving nearly but not quite the same purpose, became attached to the free ends of the caudicles-all these gradations being of manifest benefit to the plants in question.
Orkideoen polinioetan hasieran polen-aleak elkarrekin lotzeko balio zuten hariei kaudikuluez osatuz bildu arte segi dakieke; eta era berean segi dakieke gai likitsu batek, lore arrunten estigmak jariaturikoak, ia helburu bertsurako, baina ez berbererako, balio izanik, kaudikulen mutur librean atxekirik geratu arte eginiko urratsei ere, mailaketa guztiok landareen mesederako direlarik.