I HAP. VII.] 



[NSE< l- \M> PLANTS. 



61 



Fig. 28. — Hawk-moth //ii.s. convolvuli) feeding at flower, showing length 



uc when extended (natural size'. The side view ofthi 



?hows the tongue as rolled up when not in use. (Original.) 



thus securing i ross-pollination, the structural arrangement ol the 

 flower being such that pollen from the last-visited flower is brought 

 to the stigma in each cast-, therein ensuring cross-fertilisation. 



