Doath Of Trees In Cities

At a recent meeting of the Scientific Committee of the Royal Horticultural Society, Dr. Voelker stated the resulta of bis investigation of the soil of a London square in which Messrs. Veitchhad twice planted trees, which in each case had died. On exaniining the deur watery solution from treating the soil with distilled water, he fonnd that the soil contains one-tenth per cent. of comnion salt aud two-tenths per cent. of nitrates. Whenever the amouut of chlorine in soil reaches anythinglike an appreciable qnantity it exercises an injurious infhienee. Land, for exainple, which has been inundated by the sea wili not grow wheat for the next two years, though ia the first year cabbage miy be grown. The quantity of nitrates in the Foil sent to him was remarkable. Usually in a soil it did not reach a proportion which couldbeexpressed otherwise than by a third place of decimals. He could not doubt that the two saline ioarredients mentioued did the mischief.