On the whole, the best statistical source for this information is the annual computation published by the Archiv fiir Eisenbahnwesen, the official organ of the Prussian Ministry of Public Works; but the figure quoted above utilizes the Board of Trade returns for the United Kingdom and the report of the Interstate Commerce Commission for the United States.
Nature not only distinguishes between active and passive surfaces in flying animals, but she strikes a just balance between them, and utilizes both.
The second process is one patented by Fritz Ullmann of Geneva, who utilizes chromic acid to oxidize the phosphuretted and sulphuretted hydrogen and absorb the ammonia, and this method of purification has proved the most successful in practice, the chromic acid being absorbed by kieselgiihr and the material sold under the name of "Heratol."
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