Mr. Robertson, of the Government grounds, Ottawa, Canada, writes: " I have also tested the Soluble Fir Tree Oil Insecticide, and think that its merits cannot be too well known. I have used it on the most tender plants, diluted to about half a pint to one gallon of water, and it not only cleanses the plants from insect life, but adds appearance to many foliage plants. I do not wash it off, as I have seen recommended, and as yet have been unable to see any injurious effect from it.

" It must be of great value to those growing house plants, or where greenhouses are attached to a house where smoking cannot be done. I would recommend it to such people. In it they will find a remedy that they have much longed for."