4. The Slug-worm is so called from the similarity of the larva of this sawfly to a small black slug. The worms feed on the upper surface of the leaves. Dust with quick lime two or three days in succession, or syringe with strong soap-suds and some tobacco water. Clean with pure water in a few days. The paraffin emulsion (No. 3) might also be used. Quick-lime scattered around the roots and forked three or four inches into the soil may destroy their cocoons. But beware of excess. The remedy may be worse than the disease. Insects that attack leaves will also eat the skin of the young fruits if conveniently placed for them. 5. The Pear Sucker is a jumping plant-louse which early in the season sucks the juices of the tree about the axils of the leaves. They are covered with the exudations of the sap, which often drops on the ground. The visits of the ants should call attention to this pest. Syringe well with soft soap and water, ½ lb. to 4 gallons, and add tobacco water. Remove all rough bark (their hiding-places) in winter. 6. The Pear Gnat Midge (_Diplosis pyrivora_) may readily ruin a crop if unchecked. It is a recent importation among us. Both here and in the United States it is spreading with alarming rapidity. It is a small two-winged fly, with a black body having lines of yellow hair. The female pierces the flower-buds and lays her eggs in them. These soon hatch, and the young tiny grubs eat their way into the embryo fruit, keeping to the fleshy part, leaving the core and seeds alone. The pears turn brown, and then black. Cut them open, you will notice maggots. The fruit bursts or falls, the maggots form silken cocoons in the soil in which they pupate, and remain till the blossoms begin to expand next spring. Mr J. Fraser (editor of _Gardening World_) has kindly sent these details, and recommends (1) that the injured fruit be gathered and burnt; (2) that two inches of the ground beneath the trees should be taken up and burnt; (3) that kainit should be distributed round the trees in autumn. Kainit is said to keep off wireworm, and is recommended in the United States as a preventive against this pest. I think the mixture No. 2 or No. 3 should also be used, as insects may be deterred by the scent. Lime and soot spread over the ground in winter would probably do good. 7. Weevils devour leaves, buds, young shoots, even the skin of fruit. They feed by night, and may be shaken into a cloth off bushes. Lime and soot may lessen their attacks, either as a wash No. 2 or 3, or spread lightly round the stems, or as a powder over the leaves. A special bellows for distributing any dry powder (as sulphur, lime, soot, etc.) can be had from De Luzy Fréres, 44A Harold Street, Camberwell. The price is 7s. 6d., carriage paid. As a general rule insecticides should be applied in the evening or after the sun is down. Early and late visits to the trees are best for finding them feeding.