Rolling of lawns is not resorted to nearly as much as formerly. Probably one good, thorough rolling in the early spring is beneficial, especially on clay land which may have heaved in spots during the winter. Except for this, rolling is of doubtful value, especially because during dry weather it causes loss of moisture through transpiration. Weeds in the lawn indicate that the grass is not properly cared for or has been carelessly seeded. Weeds may appear in a new lawn, especially if manure has been used in the preparation. It is not necessary to pull out the annuals, for if the turf is cut they will not seed themselves. Remove only the perennials, such as burdock and plantain. Tread on the holes thus left and fill them with compost and seed. It is better to weed in the fall, as in the spring crab grass is apt to get into bare spots. Perennial weeds should be cut out with a knife, securing as much of the roots as possible; or a drop or two of gasoline will generally kill the plants. Moss and sorrel in a lawn indicate a sour soil needing liberal applications of air-slaked lime. Crab grass causes considerable trouble if once established and care should be taken to remove all portions of the roots.