When the deposits on the rocky isands off the coast of Peru were first discovered, the shipments of guano were of ligh quality, the average percentage of ammonia rangingfrom 10.98 per cent. in ;he lowest sample to 18.94 per cent. in ;he highest. But there carne a change, and as the old deposits began to be worked out and newer ones took their )!ace there carne also a reduction in the juality, and instead of 15 per cent. to 18 er cent. of ammonia and 24 per cent. of hosphates, inany of the shipments went lar below tliese figures, and where there vas nitrogen equal to 10 per cent. of ammonia the sample was exceptionally good. luiere are now, Viowever, says the Vlark Lane Express, indications of a revival of the old guano days. Since the fernvian Corporation took the matter in land a search has been made among the housands of rocky islands which exist on the west coast of Peru, where the )irds have their breeding grounds, and a arge deposit of high class guano has )een f onnd. As this has been found in ;he rainless zone and has had time to get nto that mature friableness which was ach a characteristic of the earlier shipments, the discovery is a valuable one, as the shipments which have arrived in ïurope prove. Several samples have een taken, and tliese show an analysis Tom 12 to 13 per cent. of ammonia, one ampie showing as high as 15 per cent. There can be no doubt but that these hipments mark the beginning of a new ra in the history of guano, and one vliirh will b'e marked once again by the roater use of that manure.