When Dr. Boucherie gave up his sulphate of copper process for the use of the French public, he received _a national reward_. If the Indian Government is disposed to give us _a national reward_, we could show how it may save at least half the 100,000_l._ a year--which is expended in repairing the damages done by the white ants--with little trouble. In the Madras Presidency periodical inspections have to be made, not only with regard to the white ant, but with respect to the presence and subsequent germination of vegetable matter or seeds in the mortar. In some instances, where proper precautions had not been taken, roots had formed very rapidly, and of such great size as to bodily dislodge by their pressure large stones from buildings. Therefore, to prevent this germination, a proportion of “Jagherry,” or coarse native sugar, varying from 2 per cent. in ordinary work, to from 5 per cent. to 8 per cent. in arch work, is mixed with the lime. In 1856, in consequence of the ravages of the white ants in the King’s Magazine, Fort William, India, the flooring and powder racks had to be reinstated. Captain A. Fraser, R.E., had the basement covered with concrete, 4 lb. of yellow arsenic being added to every 100 cubic feet of concrete. In the mortar used for the pillars arsenic was used in the proportion of ½ lb. to every 100 cubic feet of brickwork; a small quantity of arsenic was also mixed with the paint, and ½ lb. (four chittacks) of arsenic was also mixed with every 100 superficial feet of plaster. In 1859 the town mayor reported to the Government that no traces of white ants had since been found either inside or outside the building. Colonel Scott, when Acting Chief Engineer, Madras Presidency, reported to the Government, December 24, 1858, that the following receipt was used for exterminating white ants in the Madras Presidency, and was found to be very successful: lb. oz. Arsenic 2 4 Aloes 2 4 Chunam soap 2 13 (common country soap). Dhobies mud 2 8 (Khar). Pound the arsenic and aloes, scrape the soap, mix with mud, and boil in a large chatty half full of water until it bubbles; let it cool, and when cold, fill up with cold water. The mixture should boil for nearly an hour: it is applied as a wash. The white ants of Calcutta are small in comparison with those of the upper provinces.