* * * * * Perennial Weeds. This enumeration of noxious plants contains principally those which, although they are very troublesome, are more easy of extirpation than the last: for although the most of them are perennial, yet, as their roots do not spread as those of the above list do, they are to be effectually removed by taking up the plants by their roots. It should, however, be always noticed, that it is to little account to endeavour to clear any land of such incumbrances, if any waste places which are separated only by a hedge are allowed to grow these things with impunity; for the seeds will invariably find their way. The contrivance of nature in their formation is a curious and pleasant subject for the philosophical botanist; at the same time it is one of those curses which was impelled on human labour. 730. Butter-bur - - - Tussilago Petasites. 731. Burdock - - - Arctium Lappa. 732. Bugloss, small - - Lycopis arvensis. 733. Crowfoot, round-rooted - Ranunculus bulbosus. 734. --------, tall - - Ranunculus acris. 735. Dock, curdled - - - Rumex crispus. 736. ----, broad-leaved - - ----- obtusifolius. 737. ----, sharp-pointed - ----- acutus. 738. Fleabane, common - - Inula dysenteria. 739. Garlick, crow - - - Allium vineale. 740. -------, bear - - - ------ ursinum. 741. Grass, turfy hair - - Aira caespitosa. 742. -----, meadow soft - - Holcus lanatus. 743. -----, carnation - - Carex caespitosa. 744. Knapweed, common - - Centaurea nigra. 745. --------, great - - --------- Scabiosa. 746. Mugwort - - - Artemisa vulgaris. 747. Meadow-sweet - - - Spiraea ulmaria. 748 Ox-eye Daisy Chrysanthemum Leucanthe-mum 749. Plantain, great - - Plantago major. 750. Ragwort, common - - Senecio Jacobaea. 751. -------, marsh - - ------- aquaticus. 752. Rush, common - - - Juncus conglomeratus. 753. ----, blueish - - - ------ glaucus. 754. ----, flat-jointed - - ------ squarrosus. 755. ----, round-jointed - ------ articulatus. 756. ----, bulbous - - - ------ bulbosus. 757. Scabious, common - - Scabiosa avensis. 758. Thistle, milk - - - Carduus marianus. 759. -------, meadow - - ------- pratensis. * * * * * SECTION XVI.-EXOTIC TREES AND SHRUBS. The fashionable rage for planting ornamental trees and shrubs having so much prevailed of late years, that we meet with them by the road sides, &c. almost as common as we do those of our native soil, I have therefore enumerated them in this section.