1. Taking the broad-leaved plantain as the type of this list, we shall have no difficulty in estimating the amount of mischief which it does. Here is a plant, a single specimen of which not unfrequently occupies nearly a square foot of ground, and as its leaves grow close to the soil, it effectually prevents the growth of the grass, while few, if any, leaves are cut with the scythe. The bare patches which result from the cutting up of plantains from a lawn will sufficiently establish the first position, whilst, if one occasionally meets with a few of the leaves cut off in haymaking, it commits the further mischief of being so long in drying as to retard the process of haymaking, or else to endanger the safety of the rick. It is on account of this that the plantain has in some districts got the name of the “Fire Grass.” These are easily removed by the spud, especially if a little salt be added to their crowns. 2. Taking it for granted that grasses are for the most part the best plants for pasturage and hay, it follows that the plants of this list can only be weeds, from their taking up space and living at the expense of the wished-for crop, when, after all, the produce is either useless, or so inferior that the whole product of the field is vitiated by their presence. The best way to eradicate these and other large-leaved and tall-stemmed plants is to pull them early in the season—the true theory being, that by the repeated destruction of the leaves the rootstock ultimately decays. Close depasturing also keeps them under for the same reason, as the feet of horses and cattle so damage the leaves as to ruin the growth and progress of the other parts of the plant, which latter are requisite for its continuance. 3. Added to the evils just adverted to, this group is injurious from its adverse mechanical appliances in spinous leaves, stings, and the like. As regards thistles in pasture, they certainly argue great neglect, as they may be so readily spudded out, in which the individual is destroyed, and all hope of its progeny. It is, however, the fact that these plants are sometimes left to seed that makes the matter of destruction appear so hopeless, as the winged seeds of thistles may even find their way to a clean farm from a dirty one, and roadsides and waste places are constant sources of annoyance from this cause. So fast has the corn thistle increased in Tasmania, as to make the people groan under a “plague of thistles,” for which they have invoked the aid of special State legislation. The spud should be kept in active operation in the field, so as to prevent these plants seeding, or indeed at all occupying any space; and roadsides and waste places should be freed from these pests, either as part of the duties of some public servant, or else as a matter of private necessity. As an illustration of the fecundity of thistles, we append the following estimate of their seeding powers:— SEED-DEVELOPMENT OF THISTLES.