MALVA SYLVESTRIS AND M.ROTUNDIFOLIA (from Lubbock's _British Wild Flowers in Relation to Insects_) 29.

LYTHRUM SALICARIA, THREE FORMS OF (from Lubbock's _British Wild Flowers in Relation to Insects_) 30.

ORCHIS PYRAMIDALIS (from Darwin's _Fertilisation of Orchids_) 31.

HUMMING-BIRD FERTILISING MARCGRAVIA NEPENTHOIDES 32.

DIAGRAM OF MEAN HEIGHT OF LAND AND DEPTH OF OCEANS 33.