Nature . nozzle as well as the quantity and the nature of theliquid; it varies also with the pressure of the air insideand the inclination of the tube to the vertical. If the nozzle, wet with a magnetic liquid, be broughtclose to the conical pole-piece of a strong Faradays electro-magnet and the field excited, the pitch of the sound changesmore or less according as the magnetic susceptibility ofthe liquid and the gradient of the field is greater or concentrated solution of ferric chloride or manganesechloride, a change amounting to an interval of a third iseasily obtained. The detail
Nature . nozzle as well as the quantity and the nature of theliquid; it varies also with the pressure of the air insideand the inclination of the tube to the vertical. If the nozzle, wet with a magnetic liquid, be broughtclose to the conical pole-piece of a strong Faradays electro-magnet and the field excited, the pitch of the sound changesmore or less according as the magnetic susceptibility ofthe liquid and the gradient of the field is greater or concentrated solution of ferric chloride or manganesechloride, a change amounting to an interval of a third iseasily obtained. The details have been published in the Proceedings ofthe Tokio Physico-mathematical Society, vol. ii., No. 26. T. Terada. Science College, Imperial University, Tokio, November 5. 198 NATURE [December 28, 1905 THE PANAMA CANAL. TN the issue of August 24 a review was given of-!? General Abbots book on Problems of thePanama Canal, published this year; and in thisbook the construction of a canal with locks across the. Isthmus of Panama, in preference to a sea-levelcanal, was strongly insisted upon. The Octobernumber, however, of the National GeographicMagazine, published in Washington, contains anarticle on The Panama Canal,by Rear-Admiral Colby M. Chester,, in which the advantagesof a sea-level canal are quite asurgently advocated. Accordingly,the only points which have hithertobeen definitely settled by the UnitedStates Government assuming the re-sponsibility for the construction ofthe canal, are the final selection ofthe Panama route for the inter-oceanic canal and the consequentabandonment of the rival Nicar-agua scheme, and the certainty ofadequate funds being available forthe completion of the Panama(anal, the wanl of capital havingproved the most serious obstacle inthe progress of the works whenunder the control of a privateFrench company. There are undoubtedly severaldifficulties connected with this en-terprise which have still to be over-come, such as scarcity of labour anduns
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