VEGETABLE PHYSIOLOGY.—Under the article BOTANY, and also under PLANT, we have already delivered some of the commonly received doctrines on this subject. But as some late investigations seem to lead to new views with regard to the structure and nature of vegetables, we have thought it necessary to resume the subject, and to give as full a detail of the experiments and observations to which we allude as our limits will permit; we shall first treat of the structure, and secondly of the physiology of plants.