However, it was speedily discovered that this floor-covering suffered from one disability. Magnesium chloride is hygroscopic: it absorbs water, even moisture from the atmosphere, very readily. Consequently it became soft and damp in humid and wet weather. Otherwise it left nothing to be desired, being comfortable to the tread, silent, and warm. The German is nothing if not thorough. He does not hesitate to harness science to the wheels of industry when the occasion so demands. He realized that to utilize sawdust as a floor-covering it would be necessary to follow strict scientific lines. Accordingly the chemist was called in. He, as a result of prolonged investigations and numerous tests, succeeded in overcoming the outstanding inherent defect of the sawdust paving, and at the same time emphasized that control of the proportions of sawdust and magnesium chloride was essential owing to the first-named varying so widely in its characteristics according to the nature of the wood from which it is derived. Consequently the manufacture of this floor-covering is now supervised by the chemist, and the hygroscopic difficulty has been effectively overcome. The material has achieved a distinct vogue, not only in Germany, but in other countries. It is extremely effective and is relatively inexpensive--the cost averages from 5 to 7 shillings ($1.25 to $1.75) per square yard--bearing in mind its durable and wearing qualities. Incidentally the country has found a highly profitable outlet for its accumulations of sawdust. The world’s consumption of tin-plate has risen to enormous proportions, the extraordinary expansion of the tinned or canned food industry being responsible for this development. Thousands of tons of steel are absorbed in the manufacture of these containers, as well as hundreds of tons of tin and solder. Upon the removal of the contents the tins are generally thrown away, especially by the prodigal nations. This wastage became so flagrant as to arouse the severe condemnation of economists in every country, but these would-be apostles found it well-nigh hopeless to persuade their compatriots to endeavour to exploit the empty tins. Here and there spasmodic efforts were made upon a limited scale to recover the solder, tin, and steel-plate for further use, but the problem did not prove so easy of solution as it had appeared.