During the war circumstances militated against the fulfilment of any impressive programme of development along modern lines. Plant and machinery could not be procured owing to the prior claims advanced by other industries. Consequently the problem became resolved rather into the modernization and adaptation of existing plants, many of which suffered from being woefully inefficient. But even in this direction much was achieved which cannot fail to be of distinct value, since it has served to illustrate what can be done in this field to financial profit. Now that trade is returning to the normal we may safely anticipate a striking advance along the whole industrial line in the installation of comprehensive plants coinciding with the very latest expressions of scientific thought, and which will not fail to conduce to the winning of impressively additional wealth from this hitherto sadly-neglected material. So far as the white fish is concerned the conversion of the offal into meal represents a straightforward operation. It is merely dried under vacuum along the lines already described, a steam-jacketed drier or concentrator being used for the purpose. If the waste be stale or heavily impregnated with salt it cannot be used as food, the product in this instance being bagged for sale as a fertilizer. But the manufacturer, owing to the enhanced profit to be derived from the sale of the product in the feeding-meal form naturally strives to secure this article, and so, if designed for this use, the meal, after issuance from the drier, is passed through a disintegrator and is then graded through a sifting reel. It is the exploitation of the herring and the sprat, both in the form of offal, glut catches, and condemned consignments, which presents the most attractive future in these islands. When it is remembered that the annual yield of the sea to the fishermen of Britain represents a round 4,000,000,000 herrings, it will be conceded that here must be a Klondyke of waste. Unfortunately, however, the issue is not so straightforward as it would seem to be. An enormous quantity of the catches are set aside for salting and curing to allow of export to foreign markets. In the past Russia and Germany were our largest customers for this foodstuff, their combined purchases running to a round 800,000,000 lb. and exceeding £4,000,000--$20,000,000--in value. When the fish is salted the treatment of the offal presents a rather teasing problem. Its excessive salt content reacts against its conversion into poultry-meal except in very small quantities which are almost too insignificant to demand attention. When a fish-meal carries salt in excess of 5 per cent. it can be used as a constituent of blended or compounded foods, and then only sparingly. Consequently the possible consumption in this field can only be relatively trifling.