Lastly, St.

Hilaire found towards the southern extreme of the range of Gomphia oleaeformis two forms which he did not at first doubt were distinct species, but he subsequently saw them growing on the same bush; and he then adds, "Voila donc dans un meme individu des loges et un style qui se rattachent tantot a un axe verticale et tantot a un gynobase.

" We thus see that with plants many morphological changes may be attributed to the laws of growth and the inter-action of parts, independently of natural selection.