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Voluta nodosa, Sowerby. Phorus extensus, Sowerby. Nautilus centralis, Sowerby. Aturia ziczac, Bronn. Syn. Nautilus ziczac, Sowerby. London clay. Belosepia sepioidea, De Blainv. London clay. Leda amygdaloides, Sowerby. London clay. Astropecten crispatus, E. Forbes. The marine shells of the London Clay confirm the inference derivable from the plants and reptiles in favour of a high temperature.
"The furnace at which the test was made produces from one hundred to one hundred and ten tons per day when running on the ordinary mixture. The charging of briquettes was begun with a percentage of 25 per cent., and was carried up to 100 per cent. Quantity of Phos- ManDate Briquette Tons Silica phorus Sulphur ganese Working Per Cent.
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