... tounderstand why certain living beings arefound in certain regions of the world andnot in others. The Palm, as we know, willnot grow in our climate, nor the Oak inGreenland. The white bear ... littlewhile parallel with, though never passingthrough, the form of the meanest worm,then travels for a space beside the fish,then journeys along with the bird and the reptile for his fellow travellers: ... fertile when crossed by adistinct species than when fertilised by itsproper pollen! On the other hand, the famous Gaertner, though he took the greatest pains to cross the Primrose and the Cowslip,...