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A wireless telegraph system is being installed between Banana and Ambrizette, and the cable terminals, in the Congo region, by Mr. Paul de Bremaecker of Brussels. At present, telegrams have to be transported by boat to and from Saint Thomas, or Saint Paul de Loanda, - the cable terminals, - and Banana and Am-brizette, on the coast some distance north of these terminals.

To write on glass: moisten the surface with strong vinegar and write with an aluminum point. Infinitesimal particles of the soft metal are left adhering to the glass, and the writing is fairly permanent.

The measure introduced in Parliament a couple of seasons ago by T. M. Healy to make possible the utilization of the vast and wasted water power of Ireland will be brought up again at this session. The measure, though a most admirable one in every respect, was for some reason opposed by the landlord interest, and it accordingly received its quietus in the House of Lords. Interest in it is revived by a plan now being discussed in France for the exploitation of the resources of the Pyrenees. The mineral wealth of these mountains, particularly in zinc, aluminum and iron, has been esteemed highly since 1874. The problem has been to work them at a profit, owing to the difficulties of transport, on the one hand, and the absence, on the other, of coal to smelt the ores on the spot. The idea now is to use for this latter purpose the water power of the mountain torrents. It is claimed that in the adoption of a plan of this sort lies the industrial regeneration of France and Ireland. It is computed that the wasted water power of the Pyrenees is equal to the whole of the steam power employed in all the factories of Europe. In Ireland the conditions are similar. That large tracts of territory in Ireland contain mineral wealth of various kinds is undeniable, and if some such measure as the Healy bill became law, a long stride would have been taken toward the industrial regeneration of the country.

"While M. Santos-Dumont was inflating the balloon of his No. 6 airship at Monaco," says The Scientific American (April 5), "he was commanded by the authorities to cease immediately the process of hydrogen-making, on account of the extraordinary effect that the drainage of refuse acids and chemicals into the bay was having on the water, which had turned a brilliant orange, and which it was feared might have an injurious effect on residents near the sea-front, besides poisoning the fish.