Angraecum sesquipedale, a Madagascan orchid, with a whiplike nectary, 11 to 12 inches in length, which, according to Darwin ("Fertilisation of Orchids," Edition II., page 163), is adapted to the visits of a moth with a proboscis of corresponding length.

He points out that there is no difficulty in believing in the existence of such a moth as F.Muller has described ("Nature," 1873, page 223)--a Brazilian sphinx-moth with a trunk of 10 to 11 inches in length.

Moreover, Forbes has given evidence to show that such an insect does exist in Madagascar ("Nature," VIII., 1873, page 121).

The case of Angraecum was put forward by the Duke of Argyll as being necessarily due to the personal contrivance of the Deity.

Mr.Wallace (page 476) shows that both proboscis and nectary might be increased in length by means of Natural Selection.