Talking with an eminent ship builder, recently, we found him firm in the faith that there were many varieties-of the same species of tree, though the differences could not be detected by the most expert-botanist. He spoke particularly of White Oak and the Tulip tree, the varieties of which he could always detect by the timber, though he could see no difference in foliage, flower, or fruit. There was not merely a difference in appearance, but in some cases one form would' yield superior timber, and the other comparatively worthless. Lumber men speak of the same experience with the Scotch Pine, in Scotland.