The duty of fumigating greenhouses is such an unpleasant one that it is often neglected to the injury of the plants. A French horticulturist has made a discovery which will render it unnecessary to use smoke for the purpose. He finds that the vapor from boiling tobacco juice is as efficacious as are the fumes from the burning weed. The method adopted is simply to mix a small quantity of juice in the water and evaporate the whole. The vapor, it is said, kills all the insects in the house. Could not the same plan be adopted against house-flies and mosquitoes? Its recommendation would be its cheapness, for the juice could be expressed from the refuse tobacco which is now thrown away at the factories.