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THE CHANNEL TUNNEL.

LORD CARNARVON ON EDUCATION.

AGRICULTURAL PROSPECTS.

SEA-WATER BENEFICIAL TO SMALL.…

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PRACTICAL COOKERY.

THE LATE SEIZURE OF ARMS IN…

THE BRITISH MUSEUM.

M. DE LESSEPS ON THE PANAMA…

THE POISONOUS CONSTITUENTS…

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THE POISONOUS CONSTITUENTS OF TOBACCO- SMOKE. A series of experiments has been recently conducted by Herr Kissling of Bremen, with the view of ascer- taining the proportions of nicotine and other poisonous substances in the smoke of cigars. His paper, in Dingler's Polytechnisches Journal, gives a useful risum6 of the work of previous observers. He specifies, as strongly poisonous constituents, car- bonic oxide, sulphuretted hydrogen, prussic acid, picoline bases, and nicotine. The first three occur, however, in such small proportion, and their volatility is so great that their share in the action of tobacco- smoke on the system may be neglected. The picoline bases, too, are present in comparatively small quan- tity so that the poisonous character of the smoke may be almost exclusively attributed to the large pro- portion of nicotine present. Only a small part of the nicotine in a cigar is destroyed by the process of smoking, and a relatively large portion passes off with the smoke. The proportion of nicotine in the smoke depends, of course, essentially on the kind of tobacco; but the relative amount of nicotine which passes from a cigar into smoke depends chiefly on how far the cigar has been smoked, as the nicotine-content of the unsmoked part of a cigar is in inverse ratio to the size of this part-i.e., more nicotine the shorter the part. Evidently, in a burning cigar, the slowly-advancing zone of glow drives before it the distillable matters, so that in the yet unburnt portion a constant accumula- tion of these takes place. It would appear that in the case of cigars that are poor in nicotine, more of this substance relatively passes into smoke than in the case of cigars with much nicotine; also that nicotine, notwithstanding its high boiling point, has remarkable volatility.

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A VESSEL STRUT M BY LIGHTHINK

GREAT FIRE IN AMERICA.

LORD SHAFTESBURY ON THRIFT.…

FRENCH HONOURS FOR AN ENGLISH…

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