XI. NATURAL HISTORY.--Some Notes on Spiders.--By Rev. SAMUEL BARBER.--Some very curious observations on arachnids. 17300 XII. NAVIGATION.--From New York to Havre in a Rowboat.--The most wonderful trip on record across the ocean, with portraits of the navigators and view of the boat.--2 illustrations. 17291 The Waste of Shipping:--Losses of steam and sailing vessels due to wreckage and condemnation, with valuable tables. 17291 XIII. OPTICS.--The Colors Named in Literature.--With table. 17289 XIV. PHOTOGRAPHY.--Photography for Chemists.--Lantern slides by reduction.--How to produce lantern slides from large negatives. 17297 XV. PHYSICS.--A Research on the Liquefaction of Helium.--A research in advanced experimental physics upon the newly discovered element helium.--1 illustration. 17299 Physics Without Apparatus.--Several interesting and simple experiments described.--1 illustration. 17302 XVI. TECHNOLOGY.--Apparatus for the Manufacture of Acetylene Gas.--Description of a number of prominent acetylene apparatus, with illustrations and sectional views thereof.--12 illustrations. 17294 Belleek China.--History of this beautiful china, and foundation of its manufacture in Ireland and subsequent introduction into America.--Description of different Belleek marks. 17292 The Coming Light.--An incandescent gas burner employing artificial draught produced by electric motor.--2 illustrations. 17296 * * * * * ZANZIBAR. The sudden death on August 25 of Sultan Hamid bin Thwain, the ruler of Zanzibar, the attempted usurpation by Seyyid Khalid, and the bombardment of the palace by the British warships, have directed public attention to this comparatively little known but important city on the east coast of Africa. The Zanzibar dominions achieved their independence some forty years ago under Seyyid Majid, whose father was Seyyid Said, the Sultan of Muscat and Zanzibar. The dominions formerly extended from Warsheik south to Tanghi Bay. In 1890 the coast line from Ruvuma to Wanga, with the island of Mafia, was ceded to Germany, by which partition the country was reduced to two islands, Zanzibar and Pemba, containing about a thousand square miles with 165,000 inhabitants, a strip of coast line ten miles long, together with three smaller islands and five seaports. Zanzibar is a British protectorate, as are also the Zanzibar dominions on the mainland as far north as the mouth of the Juba. The remainder of the mainland dominions to the south are leased to an Italian company.